Hegel Elements of Right (rph)

hegel elements of right

anode heel efect

Renesans, Hegel, pozytywizm, liberalizm, marksizm, filozofia XX wieku i antropologia filozoficzna

media ethiek heel uitgebreid

Phlebotomy heel puncture

Idealismo Tedesco: Fichte e Hegel

El Idealismo de Hegel

3. text - Hegel

Vocabulary blackmail=chantage ditch= abandonner/ nom fossé iffy=douteux incertain mischievous espiègle croquette cuivre =copper stérilet =IUD pristine =immaculé crow's feet =pattes d'oie vanguard =avant garde conduct= conduite mener steadfast=inebranlable grim=sombre sinistre dread= redouter effroi loath = répugne loathsome= repugnant/detesable/odieux befitting = digne lenient=indulgent clement oursin= sea urchin /ursine (tch) pimp= proxénète watering can =arrosoir bulletproof vest = gilet pare-balle frolicking= gambadant urinary infection = uti/infection urinaire blandness= fadeur insipidité spool= bobine afore=avnt ogle= reluquer/mater skidded= dérapé/ glisser slack= mou lache slope=pent /versant irk= irriter agacer extol= exalter prôner jabber= jacasser tidal wave = ras demaree tsunami deadlock=stalemate can opener = ouvre boite mire= boue automaton= automate selflessness=altruisme ringlets= boucles anglaises snuggle =se blottir caye=île îlot dodgy=douteux mane=criniere une louche= a ladle loucher=squint disembled = faire semblant baffled= stupéfait funnel= entonnoir clog/unclog= bouche débouche bulky = encombrant, imposant to beam= diffusee:a line of light that shines from a brightobject: disruptive = perturbateur spades= piques jacks(card)= valets aces= as clubs= trèfles diamonds= carreaux brash adj= effronté, impétueux to wail= pleurnicher, gemir enhanced = rehaussé, augmenter an oar =une rame to mow= tondre to row= ramer a nightstand = table de nuit to gloat= se vanter, jubiler cuckhold= cocu daunting = intimidant tattle= rapporter, denoncer stiffen (up)= se raidir, rigide the slops= les pistes filthy=sale crasseux bliss= bonheur, felicité hence = donc/par consequent ivy= lierre a gauze= une compresse snot= morve dew= rosée coax= amadouer convaincre ripples= ondulations adamant assets=biens/ capital to go berserk= devenir fou furieux shiner folksy= folklorique swoon wince=grimace cave=grotte wobble smug bosom threshold= entree pas de la porte gallow stern token escale stop over liquider voc cheva =sell ect renes got fed up= en avoir marre splurged doused = arrose asperge blithe insouciant squashed écrase crouching accroupi swaying balancement licence = bachelor degree propriétaire d'appartement crinière toboggan hive= ruche dam= barrage glider= planeur tame= apprivoiser step-ladder= escabeau ladder= echelle whiskers= moustache (de chat) willow=saule, osier to slaughter= massacrer ablaze= embrasé to be doomed= être condamné destiny= doom hoax= canular handcuff= menottes raven= corbeau bail on= laisser tomber lean on= s'appuyer sur/ compter sur pull over= s'arrêter/ se garer suspicion=soupçon shawty= belle fille calleux= calloused clearing= clairière a track= une piste, une voie intruder= un intrus coudre= sew tricoter= knit unhinged = déséquilibré / dérangé unfortunate= malheureux/ regrettable asset= atout kick in = faire effet tire= pneu shovel= pelle wrap up=conclure/terminer leek= poireau rewind= rembobiner the seam= veine de mine appealing= attrayant/attirant/séduisant slender= mince catch up= rattraper/rejoindre/discuter kidney= rein pine cone= pomme de pin a stain=une tache cauliflower= chou fleur cabbage= chou a rope= une corde a monk= un moine shield= bouclier a pattern= un motif the lark= l'alouette a barn= une grange a homestead= une propriété to hoist= hisser a pebble= un galet,petit caillou moisten= humidifier dash off= detaller, filer the flu= la grippe to sneeze= éternuer dizzy= avoir la tete qui tourne moldy= moisi zucchini = courgette eggplant= aubergine traffic jam= embouteillage staircase= escalier feather= plume 🪶 a strap= sangle, bretelles to budge= céder, changer d'avis assert= affirmer the nerve= le culot fence= barrière cloture peeve= bete noire pastry= patisserie pastry chef/cook= pâtissier water lilies = nénuphar mesmerize= hypnotiser/ envouter slightly= légèrement recollection=memory an awaiting= une attente to hop=sauter, monter fetch=récupérer, aller chercher hatred= haine displease smug= prétentieux to brag= se venter spokesperson= porte parole oat= avoine cunning= astucieux, rusé sly= sournois odd number= impair even number= paire crutches= bequilles come out of the blue= sort de nulle part vulture= vautour crumb= miettes steam=vapeur lice= poux beat up:battre frapper band-aid : pansement a gag= un baillon clay= argile a saw= une scie doormat= paillasson bridesmaid= demoiselle d'honneur corkscrew= tire bouchon dodge= esquiver diamond= losange the fee= les frais enroll= s'inscrire dimple= fossette mellow= moelleux frame= cadre strike= grève flawless= impeccable casket= coffin slur= insulte greed= cupidity rug= tapis without further ado= sans plus attendre earmuffs= caches oreilles beanie= bonnet tripod= trépieds watercolor=aquarelle mat flaw=défaut drench= tremper smother= étouffer, asphyxier to bask= se prélasser assignment= devoir/tache/mission start from scratch= partie de rien oatmeal= flocons d'avoine shuffle= melanger (des cartes) choke up= gorge nouée lust= luxure shatter= brisé slumber= sommeil chummy= copain-copain bankruptcy= faillite bankrupt= en faillite/ ruinée railroad= chemin de fer inquieries= enquetes, investigations, questions the sod= la tourbe grasshopper= sauterelle sleigh= traineau tonsils= amygdales surly= hargneux harvest = récolte yearn= désirer a tramp= un clochard dowry= dot lowkey= discret(kinda)≠highkey seldom=rarement puzzled= perplexe feat= exploit tough-looking= costaud neglect= négligence/ négliger a channel= un détroit crosswalk= passage piéton matted= emmêlés a sore= une plaie scavenger= charognard a fan= ventilateur short-tempered= colérique embroider= broder dump= une décharge heap=tas leaflet= brochure tract flyer dusk=crepuscule boast= brag blow up=exploser premises= locaux feud= querelle creed= croyance whip= fouetter shrine = sanctuaire oak=chêne oath=serment blood test, blood sample = prise de sang wrought = forgé overthrow=renverser to flash= clignoter a turn signal = un clignotant ghastly = épouvantable horrible affreux sweatpants= joggers hankerchief= mouchoir dreadful= terrible épouvantable atonement= expiation, redemption popy= coquelicot turtleneck = col roulé safety pins= épingles à nourrice soak= imbiber, faire tremper floss= fil dentaire scum= ecume, racaille, ordure make-believe= imaginaire mousy= timide, terne bouds-> boundaries= barrières, frontières dumplings adamant a fuss brat punk weary thread gasp midget(offensive)= dwarf escapism = evasion forlorn = desespéré, abandonné, triste binoculars= jumellles amphitheater, lecture theater =amphi midwife=sage femme neckline= décolleté low-neck t-shirt= un t-shirt décolleté prise= a plug interrupteur = a switch robinet = a tap ardoise= slat s'adoucir=to soften crainte= awe apprehension= trepidation fearfulness =peur crainte meticulously sacoche = satchel cavalier = a horse rider gaze glare look etc une ouverture = an opening, an aperture stetoscope = stetoscope rapière= rapier forsake= abandonner makeover = relooking keep it up= maintenir, continuer (comme ça) a ray= une raie repasser = ironing fer à repasser= iron cloths ironing board= planche à repasser flashlight= lampe torche stroller= poussette can you give me a lift= can you give me a ride agrafeuse= stapler trombone(music) = trombone trombone= paper clip cardboard = carton backbeat= contretemps winding= enroulement, sinueux, tortueux bouillotte= heating pad sopalin = paper towel braindead= abrutis, demeuré gant de toilette= washcloth lave vaisselle= dishwasher machine à laver= washing machine loofah = fleur de douche smirk= sourire en coin, narquois a grin= un large sourire a wry smile=sourire ironique a beam smile= un sourire rayonnant torchon = a rag turd= 💩 riddle= énigme, devinette bonds=lien ≠ bounds= limites prowess= prouesse ordeal= épreuve, calvaire undergo= subir, être soumis edgy= nerveux, avant-gardiste audacieux footage= séquence, image, video roll your eyes prison cell= cellule crever qqchose= poke something hasard = chance poke an eye out= crever un oeil slip knot= noeud coulant valuable = précieux, objet précieux coton swab= coton-tige heater,radiator = radiateur boiler= chaudière glimpse= apperçu mainstream= grand public rois mage= three wise men paille = straw hay= foin creche = Christmas crib la messe = mass appetizer= apéritif USB key( or flash) clé usb lame= nul inn= auberge the laundry= la lessive laundry detergent = lessive test tube= tube à essai fur= fourrure shingles=herpes= herpès tiles= carrelage tile roof/shingle= tuiles pipes= pipes/tuyaux wellness= bien être palate= palais(bouche) wisdom teeth= dents de sagesse to be set appart calvitie= hair loss machine gun saucer = soucoupe enable drain to file= limer bump= une bosse strips= rayures scratches = rayures griffes= claw howl= hurler to rear= se cabrer to bolt= se ruer abhorred= abhorré, détester bespeak= temoigner de anguish= angoisse unearthly= unnatural uncanny = étrange, troublant begone= va t en scarcely = a peine, rarement to sport= wear (proudly) annihilation= anéantissement spurn= rejeter misdeed= méfait fiend= demon bliss= bonheur, beatitude bestowed= accorder, donner, conférer maw= gueule animal deck= pont terrasse= terrace ordonnance= prescription raccrocher= hang up≠ pick up= décroché fuguer = run away warehouse= entrepôt talon= heel 🤦‍♀️ foie=liver baver, bave= drool run off= ruissellement, fuite cleavage= décolleté public transport figurine= figurine tie (up)= attach flow= ecouler/ment,flux hem= ourlet shackles lumberjack= bucheron salopette = overall to mend= raccommoder, réparer grated(to grate)=râpés, râper a grater= une râpe heckling= chahut, interpellation a mop= une serpillière out of whack= détraqué, hors de contrôle, chamboulé=doesnt work normally wracked= ravagé, déchiré to follow suit= faire de même, emboiter le pas take over= prendre le contrôle gear= engrenage ⚙️ boiler = chaudière foolhardy= téméraire meddlesome= indiscrète shimmer= scintiller, briller glimmer= lueur, étincelle trout= truite le hoquet= hiccups groundhog= marmot= marmotte a mole= une taupe squeaky= grinçant squeaky clean= irreproachable, blanc comme neige, clean turmoil flip-flops= claquettes tongs 🩴 calf= mollet/ veau harvest= recolter collect sort out= trier play pretend= jouer a faire semblant cumbersome= bulky = encombrant païens= pagans ferrets= furets drowsy load upload flashy platypus =ornithorynque egerie first off= firstly loathsome stick out your tongue = tirer la langue 😛 butchery= boucherie pharmacy chemist chimiste bookstore= librairie red trail = piste rouge stoop= se baisser/ perron restraint= restriction/ contrainte vb= restrain windowpane= vitre/ carreau pane= vitre windpipe = trachea (trekia) huffing= souffler/ sniffer/ raler spew= cracher, degueler graft= greffe/er slot= fente spill the beans = cracher le morceau snog= rouler une pelle courbatures= muscle soreness écœurant= cloying cul sec= bottoms up/ down in one cul de sac= dead end receipt= reçu/ facture short attention span = faible capacité d'attention wreckage= epave/ debris gut= intestin boyaux bladder=vessie plump= repulpant, charnu dodu yawn 🥱 pue= pus cloques = blisters cataplasme= cataplasm to gag= relent, reflexe vomitif plaster= le plâtre cast= un platre (jambe cassée ) tampon/ner = stamp (to stamp) timbre= stamp sauvegarder = save, safeguard, back up etre pressé= be in a rush/hurry lianes = liana sangsues = leeches litchi= lychee deed= acte (ex de propriété) chocolate milk= chocolat au lait off my face insure un coffre caveman = homme de cromagnon too little to late salt shaker tap dance = claquette subtle (sutle) a demonstration= manif sole=semelle attic= grenier l taky= ringard, vulgaire a peak= un coup d'oeil whacked = frappe ou épuisé deeds=actes blast=explosion

NURS 348 — EXAM 4 STUDY GUIDE Hypertension Definition & Overview • Persistent elevation of BP ≥130/80 mmHg (systolic at/greater than 130 OR diastolic at/greater than 80) on at least 2 separate visits, 2+ weeks apart. • Primary (Essential): No identifiable cause, most common (90–95% of cases). • Secondary: Caused by another condition or adverse effects of medications. Etiology/Pathophysiology • ↑ Peripheral resistance and/or ↑ cardiac output → ↑ blood pressure → When blood vessels get narrower (increased resistance) or the heart pumps more forcefully (increased output), pressure inside the vessels rises “like squeezing a hose while water is running” → Over time, this high pressure damages the vessel walls and heart muscle, increasing the risk for atherosclerosis, heart attack (myocardial infarction), and stroke. • ↑ Increased peripheral resistance (arteriolar constriction) → ↑ afterload → left ventricular hypertrophy → heart failure → The heart pushes against more resistance (afterload), making the heart muscle thicker (hypertrophy). Over time, it becomes weaker and can lead to heart failure. • Kidneys retain sodium and water → ↑ circulating volume → The kidneys hold onto extra salt and water, adding more fluid to the blood. More fluid means higher pressure—like overfilling a water balloon. • Activation of renin–angiotensin–aldosterone system (RAAS) = vasoconstriction + fluid retention. RAAS is like the “blood pressure booster” → When this system turns on, blood vessels tighten and the kidneys save even more salt and water, both of which raise blood pressure. Risk Factors: • Primary: family history, ↑ sodium intake, Obesity (BMI >25), African-American ethnicity, smoking, hyperlipidemia, diabetes mellitus, and stress. • Secondary: kidney disease, Cushing’s, pregnancy, pheochromocytoma, medic (steroids, OCPs). Clinical Manifestations (S/S) • Often asymptomatic (“silent killer”)!!! • Headache, dizziness, fainting, vision changes • Retinal damage on exam (cotton wool spots, papilledema). • Note: if blood pressure reading is elevated then take in both arms; pt legs uncrossed, and arms above heart; correct cuff Diagnostics (Dx)/Labs • Multiple BP readings (both arms, sitting and standing) • ECG → Left-Ventricular hypertrophy. evaluates cardiac function. • Labs → ↑ BUN/creatinine (kidney disease), lipids, glucose, cortisol (Cushing’s) Nursing Care / Nursing Interventions • Monitor pt BP regularly and accurately, check both arms/correct cuff • Put on DASH diet (Dietary Approach to Stop Hypertension) Medications • ⭐️Diuretics (first-line): excess fluids, they need to remove; increase urine • Thiazides (hydrochlorothiazide) inhibits water & sodium reabsorption and increases potassium excretion • Side effects/SE: hypokalemia; monitor potassium(K⁺) levels • Loop (furosemide) decreases sodium reabsorption & increase potassium excretion– SE: hypokalemia; monitor potassium(K⁺) levels • Potassium-sparing (spironolactone) – SE: hyperkalemia; monitor potassium levels. EKG: peaked T waves • Also watch out for muscle weakness, irregular, pulse, and dehydration. • ⭐️Calcium channel blockers (verapamil, amlodipine, and diltiazem) Calcium channel blockers relax and widen blood vessels by preventing calcium from entering muscle cells, leading to lower blood pressure (vasodilation) • SE: constipation; take fiber for verapamil, and all can ↓HR • Avoid grapefruit juice ➡️ toxicity, hypotensive effects Calcium= contract • ⭐️ACE inhibitors (lisinopril, enalapril): prevents angiotensin II → vasodilation • SE: - hypotension; monitor BP and pulse HR -hyperkalemia; monitor potassium levels -erectile dysfunction -⭐️cough linked to angioedema (swollen tissue under the skin around lips, tongue, and glottis); report swelling & discontinue med • ⭐️ARBs (valsartan, losartan): for ACE-intolerant pts from cough/hyperkalemia. ARBs lower blood pressure by blocking angiotensin II from binding to its receptors, preventing vasoconstriction, and reducing fluid retention. • SE: angioedema, heart failure, hyperkalemia • Change position, slowly, report, angioedema, edema, and avoid foods that are high in potassium (bananas, potatoes, apricots, spinach, beans); monitor potassium levels • Aldosterone-receptor antagonists (eplerenone, spironolactone): blocks aldosterone action. • SE: kidney damage, hypertriglyceridemia, hyponatremia, and hyperkalemia; monitor kidney function, triglycerides, sodium, and potassium levels • Avoid Grapefruit juice and St. John’s wort, salt substitutes, and potassium rich foods • ⭐️Beta blockers (metoprolol, atenolol): blocks beta receptors (adrenaline/epinephrine) ➡️reduces heart rate, cardiac output, and blood pressure ↓HR, ↓CO; use cautiously in diabetics • SE: -⭐️erectile dysfunction, -Fatigue, weakness, depression -hypoglycemia • Monitor heart rate (hold if HR is less than 60) and do not suddenly stop taking med (cause rebound hypertension); and don’t give to pts with asthma, airway disease (cause bronchospasms) • Central Alpha-2 agonists (clonidine): calm the nerves that raise blood pressure, letting blood vessels, relax, and BP go down, ↓SNS tone • SE: sedation, orthostatic, hypotension, and sexual dysfunction/impotence • Monitor BP and pulse • Alpha-adrenergic blockers (prazosin, doxazosin): vasodilator= relaxed BP; give at night to avoid first-dose hypotension. Start with low dose. • SE: postural hypotension; make sure patient rises slowly and caution. • Monitor BP 2 hrs after initiation Complications • Hypertensive Crisis: usually when patients do not follow the medication regimen • BP >180/120 → organ damage (encephalopathy, renal failure) • S/S: severe headache, dizziness, blurred vision, confusion, epistaxis • Treat: IV antihypertensives (nitroprusside, nicardipine, labetalol); the goal is to lower BP gradually by 20-25% in first hour. Not less than 140/90. Monitor BP every 5-15 mins Patient Education • Adhere to medication regimen, don’t abruptly stop even when you feel better • Change positions slowly • Encourage DASH diet (low sodium, high fruits/veggies, low-fat dairy) ex: grilled salmon, brown rice, steamed broccoli, and low-fat milk • Avoid high-sodium foods. Consume less than 2.3 g/day • Monitor BP at home • Report signs or symptoms of electrolyte imbalances • Encourage Weight loss, exercise 3x weekly • Encourage Smoking cessation • Encourage Limit alcohol (≤2/day men, ≤1/day women) • Manage stress • Report persistent cough or swelling (ACE inhibitor red flag) Peripheral Venous Disorders(PVD) Patho: problems with veins where Deoxygenated blood can't get back to the heart Oxygenated blood pools in the extremities. The valves are preventing backflow. • Venous Thromboembolism (VTE): blood clot that starts in a vein. -Two types: deep vein thrombosis (DVT) and pulmonary embolism (PE) • Venous insufficiency: Improper functioning of the veins. Veins aren’t able to push back blood to the heart which results in swelling, venous stasis ulcers, or cellulitis. Blood can go down into the veins just fine but cannot come back up. a. VTE ex: Deep Vein Thrombosis (DVT) Pathophysiology • Thrombus (Blood clot) forms in deep veins (usually in legs) → can embolize (travel and block vessel) its way to lungs (PE). • Caused by Virchow’s triad: venous/blood flow stasis, endothelial injury, hypercoagulability. Risk Factors • Surgery (hip, knee, prostate) • Immobility • Heart failure • Pregnancy • Family hx • Oral contraceptives or hormone therapy • Cancer • COVID-19 (elevated D-dimer) • Central venous catheters Clinical Manifestations • Note that clients can be asymptomatic • Calf/groin pain (dull/achy), tenderness, warmth, edema • Unilateral swelling • Shallow, irregular shaped wounds • Too much blood, brown/yellow discoloration • Sudden SOB and sharp chest pain → suspect PE • Positioning: “Elevate Veins”, position up in “V” shape, above heart. Worsens: if dangling, sitting/dangling for long periods of time. Diagnostics • ⭐️Venous duplex ultrasonography = gold standard; it’s an ultrasound of Leg to see blood clot/blood flow through the vessel. • ⭐️D-dimer ↑ = clot breakdown evidence • Venogram/MRI if ultrasound inconclusive Nursing Interventions • Bed rest until anticoagulation started • Elevate leg slightly above heart (no knee gatch). Positioning: “EleVate Veins”, think V as veins are up, to keep the veins open. • Warm compresses • DO NOT massage leg • Compression stockings (after swelling ↓) • Encourage early ambulation when safe • SCDS Medications/Procedures (Anticoagulants) stops blood from clotting, another nurse must be with you • Unfractionated heparin (given IV): prevents clots and growth of existing clot; monitor platelets, and aPTT (how long it takes blood to clot) (1.5–2× normal). Must be given in facility. MUST MONITOR CLOSELY • Antidote: protamine sulfate • Low-molecular-weight heparin (Lovenox/enoxaparin): given SubQ, weight-based, prevention and treatment of DVT, given twice daily, can be used in home setting. Don’t need labs. Monitor for bleeding, and take bleeding precautions (Electric razor, soft toothbrush, environment safety) • Warfarin (Coumadin): oral, inhibits vitamin K clotting factors overlaps; combined with heparin 3–4 days until INR 2–3 (takes awhile to kick in; therapeutic affect) • Antidote: vitamin K • Avoid high vitamin K foods (green leafy veggies) • Monitor PT (range: 11-13.5 secs), INR (must know range: 2–3) • Factor Xa inhibitors (fondaparinux; SubQ) (rivaroxaban, apixaban; oral): Prevents development of Thromboses; transitional medication; initial labs are PT and PTT; not routinely • Direct thrombin inhibitors (dabigatran): directly prevents growth of thrombus Formation, given sub Q ; initiate initial lab values only for PT and APTT. • Antidote: idarucizumab • Thrombolytics (tPA): for massive DVT/PE, directly infused into clot, start within 24hrs- 5 days of clot formation; monitor for bleeding, neuro status, dizziness, headache. Take bleeding precautions, pt must use electric razor and, brush teeth with a soft toothbrush. • Inferior vena cava filter: prevents embolus from reaching lungs (PE), inserted in femoral vein; catches blood clot. Used when pt is unresponsive to other treatments. Monitor: bleeding, hematoma, infection, PE (dyspnea, chest pain, tachycardia). Nursing actions: assess circulation and encourage leg exercises/ambulation early, have patient not sit for too long Anticoagulant Therapy Nurse’s Role • Verify labs,;Double-check with another RN for IV heparin, Assess for bleeding (bruises, gums, stools) and Monitor vitals, mental status (signs of intracranial bleed) Reversal Agents • Heparin → protamine sulfate • Warfarin → vitamin K • Dabigatran → idarucizumab Patient Education • Avoid contact sports • Soft toothbrush, electric razor • Avoid sudden diet changes (vitamin K) Complications (anticoagulants) • ⭐️Pulmonary embolism: sudden dyspnea, chest pain, SOB, anxiety, tachypnea → emergency; sit, patient in high Fowlers, and administer oxygen and anticoagulants • ⭐️Ulcer formation(venous): often formed over the medial malleolus, chronic, hard to heal, can reoccur. Can lead to amputation/death. Neuropathic patients might not feel this. Nursing care: Dressing is left 3–7 days; wound vacuums, diet: high in zinc, protein, iron, and vitamins A and C, debride necrotic tissue so wound can heel. Patient Education(Anticoagulants) • Bleeding precautions (soft toothbrush, electric razor) • Report bruising or black stools • Avoid prolonged sitting/crossing legs • Wear compression stockings b. Venous insufficiency Pathophysiology • Valves and legs are damaged due to prolong venous HTN Our previous blood clot Risk factors: • Sitting/standing in one position for a long period of time • Obesity • Pregnancy • Thrombophlebitis Clinical manifestations: • Status dermatitis(brown discoloration along ankles) • Edema • Stasis ulcers around ankles Labs/DX • D-dimer ↑ = clot breakdown evidence, detects clot Nursing interventions: Elevate legs to increase venous return (20 mins, 4-5/day), position: legs above heart, “Elevate Veins”, Apply stockings, and monitor for cellulitis Patient education: avoid sitting/standing still for too long, change positions often, avoid crossing legs, tight clothing. Apply stockings before getting out of bed in the morning Peripheral Arterial Disease (PAD) : affects blood vessels that carry blood away from the heart; artery carries blood away from heart but has difficulty going down to extremities. Pathophysiology • Atherosclerosis in lower extremities → decreased blood flow to tissues. Risk Factors • Smoking, DM, hypertension, hyperlipidemia, obesity, age, sedentary lifestyle. Clinical Manifestations • Intermittent claudication: leg pain with exercise, relieved by rest; not enough oxygen makes the tissue suffer = pain; ischemia • Pain(sharp) that is only relieved when resting in dependent position • Cool, pale, cyanotic skin • Loss of hair on legs, thick toenails • Weak/absent pedal pulses; dorsalis pedis; Doppler(verify), +1 • Numbness, burning at night • No blood and no edema due to an adequate blood flow • Note: think “A” in PAD as Antarctica, where it’s cold! For cold, pale skin! Diagnostics • ⭐️ABI < 0.9 = PAD; ankle pressure compared to break your pressure; expected finding is 0.9–1.3; less than is PAD • ⭐️Arteriography for visualization of occlusion/decreased arterial flow with contrast injection on a x-ray. Monitor for bleeding, hemorrhage, marked, pedal pulses • Doppler studies → decreased flow in DM patients • ⭐️Exercise tolerance testing → decreased pressure in lower limbs, read the workload of the heart/circulation, and clarification during exercise. May use treadmill or meds (dipyridamole, adenosine). Finding of a BP/pulse waveform = arterial disease. Monitor vitals before, during, and after. Stop test if chest pain or symptoms are severe. Nursing Interventions • Encourage graded exercise until pain, rest, repeat • Avoid elevating legs above heart (impairs flow) • Avoid cold, caffeine, nicotine, tight clothing • Keep extremities warm (no heating pad), they can’t feel • Foot care: inspect daily, no bare feet, toenails straight Medications • Antiplatelets: (aspirin, clopidogrel) reduces blood viscosity and increases blood flow and extremities. Monitor: bleeding, abdominal pain, black, tarry stools. • Statins: (atorvastatin, simvastatin). Relieved manifestations like intermittent claudication. • Pentoxifylline: improves RBC flexibility (claudication). Monitor for bleeding, abdominal pain, black tarry stools. Procedures • Angioplasty (balloon/stent). Opens and helps, maintain the patency of the vessel, however, laser vaporizes atherosclerosis plaque. Monitor for bleeding, vital signs, pulses, cap Refill. As patients rest limbs are straight for 2-6 hrs before ambulation. Anticoagulant/Antiplatelet therapy given 1-3 months after. • Atherectomy rotation, device removes, arterial plaque. Monitor for bleeding and distal pulses. rest limbs are straight for 2-6 hrs. Anticoagulant/Antiplatelet therapy given 1-3 months after. • Arterial revascularization bypass surgery • Used for clients at risk for losing a limb, severe claudication, or limb pain at rest. It reroutes the circulation around the arterial occlusion. • Post-op: ⭐️ maintain adequate circulation in repaired artery, mark pedal/dorsalis pulses(compare both), monitor color/temp, pain, cap refill, blood pressure (HTN= risk for bleeding; Hypotension=clot risk). • Complications: for these notify provider first -graft occlusion: acute blockage of bypass graft within 24 hr(absent pulse, cold foot, increased pain) -compartment syndrome: tissue pressure restricting blood flow; causing ischemia (numbness, tingling, edema, worsening/passive pain) -infection: infection of site (warm, tenderness, elevated, WBC, purulent drainage, use sterile technique) Patient Education • Walk until pain → rest → walk more • Stop smoking • Avoid crossing legs • Diet low in cholesterol and fat Postoperative Care – Peripheral Bypass/Revascularization Priorities • Assess extremity: color, temperature, cap refill, sensation, pulses q15min ×1hr • Mark pedal pulses before surgery • Maintain adequate BP (avoid hypo or hypertension) • Do not flex hip/knee excessively • Encourage ambulation when ordered • Report sudden pain, loss of pulse, pale/cool extremity = graft occlusion Complications • Graft occlusion, Compartment syndrome, Wound infection Arterial vs. Venous Ulcers Feature Arterial Ulcer Venous Ulcer Location Toes, feet, lateral ankle Medial ankle Appearance Pale, dry, round “punched out”, no drainage Irregular, leaky/moist, brown discoloration Pain Severe, worse with elevation Achy, relieved with elevation Skin Cool, shiny Warm, thickened Treatment Improve arterial flow Compression therapy, elevate legs Valvular Heart Disease OVERVIEW Overview • Stenosis = narrowed opening/thickening and hardening • Regurgitation = backflow of blood • Causes: rheumatic fever, degenerative calcification, endocarditis Diagnostics • Chest X-ray → chamber enlargement • ⭐️ECG → hypertrophy • Echo → valve dysfunction • TEE → direct view of valves ⭐️ Medications overview • Diuretics [furosemide, hydrochlorothiazide, spironolactone]: reduce pulmonary congestion, by removing excessive extracellular fluid. Monitor: hypokalemia, eats foods high in potassium, and administer furosemide IV slowly over 1 – 2 minutes. • Afterload–reducing agents [Beta-blockers (-lol); calcium channel blockers (-dipine); ACE inhibitors (-pril); angiotensin–receptor blockers (-artan); vasodilators (hydralazine]): control heart rate, by lessening resistance to contraction. Monitor: hypotension. • Inotropic agents (digoxin): increases contractility, improves cardiac output. Hold medication if pulse rate (abnormal) is less than 60/min or greater than 100/min. Take medication same time every day, avoid combining with antacids (2hrs). Monitor: toxicity such as weakness, confusion, visual changes, low appetite. • Anticoagulants: reduces risk of thrombus. Monitor: stroke, PT, INR, bleeding/bruising. Procedures • Valvuloplasty (balloon dilation) • Valve replacement • Mechanical = lifelong anticoagulants • Tissue = replace every 7–10 years Patient Education • Prophylactic antibiotics before dental procedures • Good oral hygiene • Daily weights • Sodium restriction • Avoid caffeine/alcohol • Report HF signs (weight gain, edema, SOB) • Avoid alcohol, epinephrine, and ephedrine= can cause dysrhythmias THE 4 VALVULAR DISORDERS Mitral Stenosis Etiology/Pathophysiology: Narrowed mitral valve obstructs blood flow from left atrium (LA) → left ventricle (LV), increasing LA pressure and pulmonary congestion → right-sided heart failure. Often caused by rheumatic fever. Clinical Manifestations: Dyspnea on exertion, orthopnea, pitting edema, fatigue, palpitations, hemoptysis, apical diastolic murmur. Risk Factors: Rheumatic heart disease, aging, congenital malformations. Labs/Diagnostics: Echocardiogram (valve narrowing, pressure gradient), ECG (A-fib), chest X-ray (LA enlargement). Medications/Management: • Diuretics [furosemide, hydrochlorothiazide, spironolactone]: reduce pulmonary congestion, by removing excessive extracellular fluid. Monitor: hypokalemia, eats foods high in potassium, and administer furosemide IV slowly over 1 – 2 minutes. • Afterload–reducing agents [Beta-blockers (-lol); calcium channel blockers (-dipine): control heart rate, by lessening resistance to contraction. Monitor: hypotension. • Anticoagulants: reduces risk of thrombus; prevent emboli from A-fib. Monitor: stroke, PT, INR, bleeding/bruising. • Surgical: Balloon valvuloplasty or valve replacement. NCLEX Tip: Rheumatic fever is the most common cause. Mitral Insufficiency Etiology/Pathophysiology: Incomplete closure of mitral valve causes blood to leak back into LA during systole → LV dilation and hypertrophy. Clinical Manifestations: Fatigue, dyspnea, orthopnea, palpitations, holosystolic murmur at apex, pitting edema, S3 sounds Risk Factors: Mitral valve prolapse, rheumatic disease, MI, endocarditis. Labs/Diagnostics: Echocardiogram (regurgitant volume), ECG (A-fib), BNP (HF indicator). Medications/Management: • Beta-blockers (-lol); ACE inhibitors (-pril); ARBS/angiotensin–receptor blockers (-artan): reduce afterload /control heart rate, by lessening resistance to contraction. Monitor: hypotension. • Diuretics [furosemide, hydrochlorothiazide, spironolactone]: manage fluid overload. Monitor: hypokalemia, eats foods high in potassium, and administer furosemide IV slowly over 1 – 2 minutes. • Anticoagulants if A-fib present; reduces risk of thrombus; prevent emboli from A-fib. Monitor: stroke, PT, INR, bleeding/bruising. • Surgery for severe cases. NCLEX Tip: Afterload reduction decreases regurgitant flow. Aortic Stenosis Etiology/Pathophysiology: Narrowed aortic valve → obstructed LV outflow → ↑ LV pressure → hypertrophy → ↓ cardiac output. Clinical Manifestations: Triad: angina, syncope, dyspnea (heart failure); systolic murmur radiating to carotids. Risk Factors: Aging (calcification), congenital bicuspid valve, rheumatic fever. Labs/Diagnostics: Echocardiogram (valve area), ECG (LV hypertrophy), cardiac cath (pressure gradient). Medications/Management: • Avoid nitrates/vasodilators (can cause hypotension). • Use beta-blockers (-lol) cautiously. reduce afterload /control heart rate, by lessening resistance to contraction. Monitor: hypotension. • Surgical aortic valve replacement (definitive). NCLEX Tip: Do not aggressively lower preload; maintain perfusion. Aortic Insufficiency Etiology/Pathophysiology: Incomplete closure of aortic valve → backflow of blood into LV → volume overload → dilation and LV hypertrophy. Clinical Manifestations: Dyspnea, palpitations, fatigue, bounding (“water hammer”) pulse, wide pulse pressure, diastolic murmur. Risk Factors: Rheumatic fever, endocarditis, Marfan syndrome, trauma. Labs/Diagnostics: Echocardiogram (backflow volume), ECG (LV enlargement), chest X-ray (cardiomegaly). Medications/Management: • Calcium channel blockers (-dipine); ACE inhibitors (-pril); vasodilators (hydralazine]): reduce afterload /control heart rate, by lessening resistance to contraction. Monitor: hypotension. • Diuretics for volume management. • Surgical valve replacement when severe. NCLEX Tip: Bounding pulse and wide pulse pressure are hallmark findings. General Nursing & Exam Focus • Best diagnostic test: Echocardiogram (for all). • Monitor for A-fib in mitral disorders. • Valve replacement (mechanical): Lifelong anticoagulation. • Daily weights & fluid balance: Detect early HF. • Positioning: High-Fowler’s for dyspnea, low-sodium diet. Inflammatory Heart Disorders (Endocarditis, Pericarditis, Myocarditis, Rheumatic Carditis) Risk Factors • IV drug use, valve replacement, streptococcal infection, immunosuppression, lower socioeconomic status Pericarditis: inflammation of the pericardium (sac around heart) -RF: heart attack, lupus, rheumatoid arthriti -Clinical manifestations: Chest pain (relieved when leaning forward), coughing, Pericardial friction rub, fever, dysrhythmias, and SOB -Labs/DX: • High WBCs, EKG showing ST or T spiking, echocardiogram (inflamed heart) -Nursing care/Intervention: address pain/inflammation, and monitor for cardiac tamponade, position, patient upright, leaning forward, and monitor ECG - Medications: NSAIDs, corticosteroids, anti antibiotics for bacterial • Ibuprofen/NSAIDs for inflammation (pericarditis). Avoid if patient has peptic ulcer, monitor for G.I. bleeding, platelets, liver/kidney function. Must be taken with food, avoid alcohol. • Corticosteroids (prednisone) for autoimmune causes (pericarditis/myocarditis). Low-dose first, take with food, and patient must not stop abruptly. Monitor BP, glucose, electrolytes, wounds, infection, sudden weight gain. -Complication: cardiac tamponade → muffled heart sounds, paradoxical pulse, JVD, hypotension (Beck’s triad) Myocarditis: inflammation of the myocardium (heart muscle itself) -RF: viral (covid, Coxsackie), fungal, or bacterial infection; autoimmune disorder -Clinical Manifestations: Tachycardia, chest pain, murmur, friction rub, dysrhythmias, peripheral swelling, cardiomegaly. -Labs/Dx: ECG, echocardiogram, high troponin, CK – MB, ESR in CRP for inflammation/injury -Nursing Care/interventions: monitor for heart failure, and dysrhythmia’s, provide rest and activity restriction -Medication: • Amphotericin B for fungal infection (myocarditis/endocarditis). Monitor liver/kidney function for a G.I. upset. • Corticosteroids (prednisone) for autoimmune causes (pericarditis/myocarditis). Low-dose first, take with food, and patient must not stop abruptly. Monitor BP, glucose, electrolytes, wounds, infection, sudden weight gain. Endocarditis: bacterial infection that leaves inflammation of the endocardium (inner layer of the heart); bacterial or fungal Infection of endocardial tissues that leads to necrosis and embolization of growth -RF: congenital/valvular heart disease, prosthetic valve, IV drug use -Clinical Manifestations: janeway lesions, Fever, murmur, petechiae, splinter hemorrhages (red streaks under nail beds), Osler’s nodes -labs/dx: positive blood culture, echocardiogram -nursing interventions/care: administer IV antibiotics, antipyretics for fever, and anticoagulants, patient should use soft toothbrush, and prophylactic antibiotics before dental/invasive procedures -medication: • Penicillin for infection (rheumatic fever/endocarditis). Monitor for allergic reaction, kidney function/electrolytes. • Amphotericin B for fungal infection (myocarditis/endocarditis). Monitor liver/kidney function for a G.I. upset. Rheumatic Carditis/heart disease: infection of endocardium due to complication of rheumatic fever; GABHS triggers, rheumatic fever leading to inflammatory lesions in the heart -RF: children, Follows untreated strep infection -Clinical Manifestations: tachycardia, Fever, rash(trunk/extremities), joint pain, murmur, chest pain, muscle spasms, friction rub -Labs/Dx: throat culture (strep infection), positive ASO titer, echocardiogram -Nursing care/Interventions: administering antibiotics to stop strep infection, and promote rest, monitor for heart failure, and encourage life on prophylactic antibiotics. -Medications: antibiotics, valve replacement/repair • Penicillin for infection (rheumatic fever/endocarditis). Monitor for allergic reaction, kidney function/electrolytes. Nursing Interventions (Overview for Inflammatory disorders) • Monitor for tamponade & HF • Administer antibiotics (penicillin) • Pain relief (NSAIDs for pericarditis) • Bed rest • Emotional support • Auscultate heart sounds; murmur or friction rub • Collab with cardiologist and physical therapists Procedures (Overview for Inflammatory disorders) • Pericardiocentesis for fluid removal, then sent to laboratory; monitor for recurrence of cardiac tamponade. ( pericarditis.) • Valve surgery if damaged Complications (Overview for Inflammatory disorders) • Cardiac tamponade: medical emergency resulted from fluid accumulation in pericardial sac. S/S: dyspnea, dizziness, tightness in chest, restlessness. Administer IV fluids, notify the provider, obtain chest, x-ray or ECG Cardiac Diagnostics & Vascular Access (Ch. 28) Transesophageal Echocardiography (TEE) Provides clear heart images via probe in the esophagus to detect valve disease, thrombi, or heart failure. NPO 4–6 hr, monitor VS, ECG, and sedation; check gag reflex before eating post-procedure; keep HOB 45°. Stress Testing (Exercise or Pharmacologic) Assesses heart’s response to stress for angina, HF, MI, or dysrhythmia. NPO 2–4 hr, avoid caffeine/tobacco, wear comfortable clothes; stop test for chest pain, SOB, dizziness. Post: monitor ECG & BP until stable. Coronary Angiography (Cardiac Catheterization) Identifies coronary artery blockages using contrast dye via femoral, radial, or brachial artery. NPO 4–6 hr, assess renal function, allergies (iodine/shellfish), and hold metformin 48 hr before/after. Post: monitor VS and site for bleeding, hematoma, or thrombosis, keep limb straight, maintain bedrest. Complications: cardiac tamponade (↓BP, JVD, muffled heart sounds), embolism, hematoma, AKI—notify provider. Teach: report chest pain, bleeding, SOB, avoid lifting >10 lb, and take antiplatelets as prescribed if stent placed. Vascular Access Devices (VADs) Provide reliable central access for fluids, meds, TPN, or blood. Verify tip placement via x-ray before use. PICC: up to 12 mo use, insert in basilic/cephalic vein → SVC; no BP/venipuncture in that arm, keep dressing dry. Tunneled Catheter: long-term use, subcutaneous tunnel prevents infection; no dressing once healed. Implanted Port: long-term chemo access; access with Huber needle, flush with heparin after use. Complications: • Phlebitis: redness, pain, warmth—maintain sterile technique. • Occlusion: flush gently with 10 mL syringe; never force. • Mechanical issues: swelling or pain at port site = dislodgement → notify provider

Astronomi: Vetenskapen om Universum Geocentrisk världsbild: Jorden anses vara universums centrum och allt kretsar kring jorden. Heliocentrisk världsbild: Beskriver solsystem, att solen är i centrum, planeter kretsar kring den. Explosion Teorin: Universum uppstod av en jättestor explosion för 13,7 miljarder år sedan, tor på Big Bang(den stora smällen): Explosion av rymden, då tid och rum uppstod tillsamman med den Materia ochs strålning uppstod och spreds → materian bildade grundämnen(helium och väte) samt planeter och stjärnor Solsystemet: 8 planter(4 sten och 4 gasplaneter) + deras månar, dvärg planeter, asteroider och kometer + en sol Solen antas ha ungefär 4,5 miljarder år kvar att leva Olika teorier om universums framtid: Big freeze(värmedöden): Universum fortsätter expandera, kallare och gles tills stjärnbildning upphör Big rip: Expansionen accelererar kraftigt tills stjärnor och atomer dras isär Exoplaneter: planeter som kretsar kring andr stjärnor än solen, många har upptäckts, men ej något liv Söker i behagliga zoner där temperatur ska tillåta flytande vatten --------- Himlakroppar: Naturliga föremål i rymden Ex stjärnor, planeter osv Stjärnor: Lysande klot av het gas (helium och väte) Föds i en Nebulosa som kollapsar, när gravdistion drar ihop → ökar trycket och temperaturen → start kärnfusion → väte omvandla till helium = stjärna Nebulosa(stort gasmoln): Består av materia(dam och gas) som dras ihop av gravitationskraft = stjärna De har en enorm massa Stjärnans livscykel: Föds → Stabilt tillstånd(gott om bränsle) → Slut på väte = sväller upp → Röd superjätte→ Krymper = Vit dvärg → svalnar och mörknar Stor/tunga stjärnors död kan bilda en Supernova: Stjärnas ytter sprängs och delas = stark ljusstjärna Ibland Neutronstjärna i mitten(liten kompakt himlakropp) Svarthål: En himlakropp vart stjärnor pressas samman till en punkt, med en kraftig garvidstion Inga föremål lämnar inte ens ljus (oftast först supernova sedan svart hål) + Stjärnor släpper gaser och stoft när de dör → skapar nya nebulosor (så universum kretslopp fortsätter) Temperatur på stjärnor = färg ↓ Vita stjärnor/dvärgstjärnor: Minsta och varmast(10 000 garder) Gula stjärnor: Temperatur(6000 grader) EX solen Röda stjärnor/röd jätte: Störst och har lägst temperatur (3000 grader) Jättestjärnor: Stjärnor större än solen, låg temperatur = röda stjärnor Dvärgstjärnor: Stjärnor mindre än solen, hög temperatur = vita stjärnor EX: Solen, 4,5 miljarder år gammal(solen strålar är ljus/värmeenergi från fusionen som uppnår inuti solen) Dubbelstjärnor: 2 stjärnor rör sig runt varandra / trippelstjärnor: 3 st Stjärnhopar: Många stjärnor samlade i större grupper Stjärnbilder: Människor som organisera natthimlen med igenkännbara mönster’ Astrologi: Läran att tolka himlakroppar position under mänsklig födelse, bygger på förutsättningar och gammal tro ------ Ljusår: Sträckan ljuset förd på ett år, enheten använd för att ange avstånd i rymden. Ljus från stjärnor kan ta år innan de syns på jorden EX: Polstjärnan 780 ljusår → ljus färdats i 780 år , Solen 8 ljusminuter Triangelmetoden: Använd räkan avstånd i rymden Galax: Ett enormt stjärnsystem, är universums byggstenar Finns mer än 100 miljarder galaxer Olika former: Spiral, klot eller ellipsformade Galaktiskt år: Tid de tar för solsystemet å ha ett varv runt centrumet av galaxen EX: Vintergatan, spiralformade har ca 200 miljarder stjärnor Mörk energi: Energi som drar galaxer från varandra Mörk materia: Masteri i unver som vi ej ser --------------------- Partiklar, värme och tryck: Partiklar: minsta beståndsdelarna av materia EX Atomer atomkärnor - protoner, neutroner(finns kvarkar) och elektroner( är Leptoner) Fotoner(ljuspartiklar) Elementarpartiklar: Minsta struktur(kan ej delas mer) EX: kvarkar Subatomära partiklar: Partiklar mindre än atom + de som uppbyggda andra partiklar EX: Neutron, proton 118 grundämnen(94 naturlig) -------- Materia: Allt som väger något + de innehåller atomer Massa = Vikt, hur mycket materi ett föremål innehåller Mäts i Kg, ton, hg och g Volym: Utrymmet ett tredimensionell föremål upptar beräknas 2 sät Bredd x längd x höjd Oregelbundna föremål: Vatten i mätglas + lägg ner föremålet, sedan subtrahera skillnaderna Densitet: Hur sammanpackad ett ämne är(hur tät partiklar är packade) Densitet = massa/volym (p=m/V) → kg/dm3< g/dm3 Densitet avgör flyttnings förmåga, måste ha lägre densitet än vatten ---------- Värme(värmeenergi): Total mängden energi som överförts på grund av temperaturskillnader Temperatur: mått på hur mycket atomer och molekyler rör sig Absoluta nollpunkten = -273,16 grader Celsiusskalan: oC 2 fixpunkter Vattens frys (0 grader) och kokpunkt (100 grader) Kelvinskalan: Utgår från absoluta nollpunkten(273 grader)som fixpunkt Fahrenheitskalan Värmeutvidgning: Varma ämne utvidgar sig = tar mer plats = ändrar volym EX: luftballong(Varma luft lägre densitet = flyger), Sly Bruk(varmvatten = glas och metall utvidgar sig men metall> glas) ämnen blir kallare = mindre volym och massa ändras ej = Höger densitet Gäller ej vatten → 4 grader = volymen minst, försäter till o = större volym = lägre densitet --------- Aggregationstillstånd: Olika former materia kan få beroende på tryck och temperatur + de har fasövergångar Fast from: Molekyler på bestämda platser och vibrerar EX: is Smältning ↓ Stelning/frysning ↑ Flytande from: Molekyler kan rör på sig mer fritt EX vatten Förångning/avdunstning ↓ Kondensation↑ Gasform: Molekyler rör sig fritt EX: vattenånga ------- Sublimering: Fast → gas /Disposition: Gas → fats Smältpunkt: Temperatur vart ämne fast → flytande (vatten - 100 grader) Kokpunkt: Temperatur vart ämne flytande → gas Värme sprid på 3 sätt: Ledning: Atomer vibrera och knuffar varandra så värme sprids Metaller leder värme bra EX: silver och koppar Trä, gummi,plast och luft leder värme dåligt Strömning: När gas eller vätska flyttar på sig och transportera värme med sig Ex: Kastrull → varmt vatten på botten= lägre densitet → byter plat med kallt så att de värms → sen cirkulerar Element under fönster → värmer luft(låg densitet) → stiger åt taket = kalla luft på golvet går igenom element → sen cirkulerar Strålning: Värme från solen transporteras men infraröd strålning/värmestrålning(kan genom vakuum) Svarta yto fångar bäst upp strålning från sol Solfångare(värmer vatten)och solceller(skapar elektricitet) ---------- Tryck: Hur kraft fördelar sig på en yta Mäts i (N/m2)Newton per kvadratmeter = (Pa)Pascal 1N/m2 = 1 Pa / 1 kPa = 1000 Pa Tryck = Kraft/Area → P = F/A Skapas av både fasta föremål, vätskor och gaser Liten area = Högt tryck EX: Bra knivar, yxor skär igenom material Stor area = Lågt tryck EX: Bra långfärdsskidor på sjö EX: Ligga ner på mage när man hjälper någon som hamnat i is - trycket fördel på söre area så att isen ej spricker mer. Vattentryck: Tryck i vatten, beror på vattnets tyngd + hur hög densitet(avgör tyngd EX: hög densitet = stor tyngd = högt tryck) ökar desto djupare man kommer. Manometer: Tryckmätare(mäter tryckskillnader) Arkimedes princip: Hur krafter påverka föremål i vatten, Vätskans lyftkraft är lika stor som tyngden av vattnet föremålet tränger undan Höger densitet = större lyftkraft(Ex saltvatten högre densitet än vanligt vatten = större lyftkraft) Lyftkraften större/lika med föremålets tyngdkraft = flyter Kommunicerande kärl: Vätskebehållare som sitter ihop i botten kommer alltid ha smam vattennivå Eftersom lufttrycket är lika på alla yto så tvingar gravitation de att hamna på samma nivå Ex: Läsa av nivån i tanken, utnyttjas för att få fram vatten till bostäder Vattentorn är högre än bostäder = Tryck i vattenledningar, eftersom vatten i rören strävar efter att nå samma höjd som vattnet i tornet. Lufttryck: Skapas av atmosfären(luftlager) har massa som skapar tryck mot jordyta, trycket minskar med höjden Barometer: tryckmätare(omgivningens luftryck) Normal lufttryck vid havsytan 1013 hP Flygplan: Tryckskillnad mellan vingen över och undersida(formad luft rör sig fortare på ovansidan) - snabb luft = mindre tryck översidan = Höger tryck på undersidan = vingen tycks upp, på grund av den ökade lyftkraften Övertryck: Högre tryck än lufttrycket i omgivningen Komprimerade gaser: Trycker ihop gas så de tar mindre plats + temperaturkänsliga(gaser utvidgas när de blir varmt) EX: Cykeldäck, ballonger, sprejburkar Undertryck: Lägre tryck än lufttrycket i omgivningen Vakuum: Få/inga luftmolekyler/partiklar alls(säg tyckte mind än en tusendel) = Varan lärare fraktats + dra ej fukt till sig = håller bättre och längre Sänka gasen temperatur = trycket sjunker -------- Meteorologi: Studerar väder Väder uppstå eftersom luft, mark och hav värms olika mycket Natur vill utjämna skillnader i temperatur och tryck → sätter luft i rörelse = olika väder Lufttryck: Tyngd av atmosfärens luft som trycker mor marken Högtryck: luft höger än omgivning /Lågtryck: luft lägre än omgivning Varm luft - låg densitet → stiger → lågtryck Luft kyls av atmosfären(luftlager, vart väder bildas) Kall luft - hög densitet → sjunker → högtryck Strömer mellan hög och lågtryck = vind Sjöbris: Varmare luft snabbare över land än i vatten, Varm luft stiger över land och ersätt med kall luft från vatten Moln: Fuktig luft stiger och kyls av får osynlig vattenånga högt i atmosfären som kondensera = Vattendroppar → samlas och ser ut som moln Regn: vattendroppar slås ihop - tunga - faller Kalla i moln → iskristaller slås samman med vattendroppar = regn, snö eller hagel Växthuseffekten: Solens strålar värmer jorden och jorden skickar tillbaka den som värmeenergi(infraröd strålning). En del stannar kvar i atmosfären på grund av växthusgaserna - nödvändigt för liv på jorden Orsaker till ökad växthuseffekt: Förbränning av fossila bränslen → mer växthusgaser - ökar jorden temperatur Ökad konsumtion Avskogning - minskar jorden förmåga att ta upp koldioxid Industriell processer - släpper ut växthusgaser Vad ökad växthuseffekt kan leda till: Jordens medeltemperatur stiger Häftigare väder + natruskastofer Glaciärer smälter - brist på dricksvatten Isar smälter - havsytan stiger - landområden för översvämningar ---------- Kraft och Rörelse: Likformig rörelse: Rörelse med samma hastighet och riktning, EX: Plan flyger med samma hastighet och trak sträcka. Olikformig rörelse: Rörelse där hastighet och riktning ändras konstant EX: Plans start och landning. Accelererad rörelse: Hastighet ökar konstant Retarderad rörelse: Hastigheten minskar konstant Medelhastighet: hastigheten förändras konstant, räknar man ut genomsnittsfarten. S(sträcka) = V(hastighet) x t(tid) Svt Kraft: Skapar/motverkar en rörelse - fins olika typer har angreppspunkt, storlek och riktning Mäts i N(newton) med hjälp av Dynamometer(fjäder + krok) Stor tyngd = större kraft / liten tyngd = mindre kraft Gravitationskraft(allmän): Kraft där alla materia med massa attrahera annan materia Tyngdkraft/jordensdargningskraft(spefik): Gravitationskraft som håller oss kvar på jorden. För att “sväva” måste man övervinna tyngdkraften Jordensdragninskarft: 1kg = 10N( 9,8N) Månens dragningskraft är 1/6 delas av jorden(månens mass 6 gånger mindre) Tyngd: Mått på hur mcyket gravidstionkarft påverkar ett förmål(N) Massa: Mått på hur mycket materia ett något innehåller(kg) ----------- Ex på olika sorters kraft ↓ Motkraft: Kraft som motverkar annan kraft Tyngdkraft: kraft som drar till jorden Normalkraft: Motverkar tyngdkraft Friktionskraft: Bromsande kraft, påverkas av ytan föremålet står på Dragningskraft: Motverkar frikstionskraft Nettokraft: Skillnaden mellan en kraft och en motverkande kraft --------- Friktion: Bromsande kraft, mäts i N, motverkar kraft som vill få objekt i rörelse. Uppstår: ojämna ytor greppar tag i ojämnheterna hos varandra(2 ytor kontakt med varandra) Stor friktion: Bra grepp, bromsar kraftigt(ytor greppar tag) EX: Gummi mot asfalt, bar vid klättring osv) Liten friktion: Halt underlag(ytor glider lätt) EX: skridskor på is, åka skrana, kullager(förmål 2 metallytor som rör sig med kulor mellan för mindre friktion) -------- Tyngdpunkt: Punkt vart hela objektets mass/tyngd är samlad Stödyta: Yta föremål har mot underlaget, stabilitet - (tyngdpunktens lodlinje hamnar inom stödytan) Stödyta ofta större area än vad de står på Tyngdpunkten närmare marken = större stödyta Tyngdpunkt längre från marken = mindre stödyta Lodlinje: Tänkt rätt linje som går igenom jorden medelpunkt När man välter så är lodlinjen utanför stödytan(tyngdpunktens läge ej förhållande med stödyta) Lod: Verktyg(lina med en tyngd) används i bygge se till att väggar är raka Luftmotstånd: Sort friktionskraft, föremål krokar med luftmolekyler Vakuum: Plats utan luft + luftmotstånd(tomt på atomer) Fritt fall: fall utan luftmotstånd, om kastar 2 föremål oavsett form, vikt osv = nudda marken samtidigt Galileo galilei kom på terrio - ej utsrutsing att testa Hur föremål faller: kastar en sten rakt ner samtidigt en rakt fram, vad händer? Stenarna landar samtidigt, sten som kastats rakt fram hamnar längre bort( påverkas av en oberoende kast kraft) påverkas av tyngdkraft, acceleration + luftmotstånd(vid längre sträckor) → när luftmotstånd = tyngdkraften → slutar acceleration → tills den når marken Kaströrelse: Bågformad rörelse, föremål rör sig med jämn fart fram och sen faller snabbt när tyngdkraften drar den tillbaka EX: satellit: Måste kastat i en kaströrelse med samma form som jorden bågformade yta + rätt hastighet och vinkel Satelliten faller hela tiden utan att falla ner på jorden(Jorden böjer sig undan) --------- Newtons 3 rörelselagar: Tröghetsprincipen/tröghet: Kroppen vill förbli i vila/likformig rörelse så länge motverkande krafter = 0(annars är man i balans) Accelerationslagen: Kraft = Massa(kg) x Acceleration(m/s2)( F = M x A) Lagen om reaktion och morekastion: Föremål påverka ett annat med en kraft så påverkar de andr föremål de första med lika stor men motriktad kraft -------- Centralrörelse: cirkulär rörelse där föremålet cirkulerar kring en central punkt på grund av: Centripetalkraft: Kraft som drar föremål i en cirkulär rörelse mot mitten, får föremålet att ändra riktning och följa kurvan Centerprikalkarft upphör = Centralrörelsen upphör EX: Åka pulka i centerrörelse, när man släpper, upphör centralkraft = man sängs rakt fram För stalierr och månen så är deras centrala kraft = tyngdkraft Centrifugalkraft: Fiktiv motkraft mot centripetalkraft, få dig ur centrala banan på grund av den naturliga trögheten Centrifugering: i tvättmaskiner använder centripetalkraft och tröghet Roterar 1200 varv/min där vatten och tvätt pressas mot väggar Centripetalkraft håller centralrörelse + hålen i trumman suger ut vatten på grund av tröghet ----------- Enkla maskiner: Verktyg som behöver lite kraft för stort arbete Följer Mekanikens gyllene regel: Det man vinner i kraft förlorar man i väg och tvärtom EX: Lutande planet, skruven, hjulet, hävstången osv Hävstången består av Vridningspunkt(Punkt som är stilla och skiljer härmar åt) och 2 Hävarmar(Avståndet mellan vridningspunkt och kraftens angreppspunkt) EX: Gungbräda tynger person närmare vridningspunkten + lättare person länger från vrdininpunkten = jämvikt Hävstångsprincipen: Kraften (F1) * Sträckan (hävarm 1 = L1) = Kraften (F2) * Sträckan (hävarm 2 = L2) Vänstra vridmomentet/ arbetet (Nm) = Högra vridmomentet / arbetet (Nm) Fysikaliskt arbete: När man övervinner en kraft + att föremål förflyttas Arbete(W) = Kraft(F) i Newton x Sträcka(S) i meter (Work = Force x Stretch) Mäts i enheten newton meter (Nm)(1 Nm = 1 joule) Effekt: Hur snabbt arbete utförs Effekt(W) = arbete(J)/tid(s) Mekanisk energi: Summan av rörelseenergi och lägesenergi( elektrisk energi räknas också med) Lägesenergi och elektriskt energi → rörelseenergi (och tvärtom) ------------ Ljud/Akustik och Ljus/optik: Ljus färdas snabbare än ljud Ljus: fotoner eller vågrörelse → hastighet på 300 000 km/s Synligt ljus: Ljus människor ser Osynligt ljus: Ljus människor ej upptar Ex infraröd strålning, Uv-strålning och elektromagnetisk strålning Ljuskälla: Något som sänder ut ljus Naturligt ljus/källa: EX: sol Artificiell ljus/källa: EX: lampa Vår ögon(näthinnor skickar nervsignaler → hjärnan skapar bild) upptar ljus som reflekteras på föremål från/eller ljuskällor som sänder ljus strålar Reflektion: Vågor(ljus,ljud osv) som studsar tillbaka åt fler håll Reflektionslagen: Ljus träffar reflekterande ytor har samma infallsvinkel som reflektionsvinkel(mätt mot rätvinklig, tänkt linje normalen) Plan spegel: Platt, skapar verklighetstrogna spegelbilder som är spegelvända(höger och vänster byter plats) Brännpunkt/fokus: Punkt där ljusstrålar mötes efter passerat/reflekterat genom lins/spegel, samlingspunkt där ljus reflekteras Brännvidd: avstånd mellan brännpunkt och spegel/lins Konkav spegel: Inåtbuktande (parallell) ljus strålar reflekteras åt samma punkt(brännpunkten) framför spegeln → ser ut att smalar ljus förstorad(innanför brännpunkt) rättvänd bild(långt avstånd = upp och nervänd bild(utanför brännpunkten) Används: teleskop, sminkspeglar, parabolantenner(samlar tv/radiosignaler) Konvexa spegel: Utåtbuktande (parallell) ljusstrålar reflekteras ått samm punkt(brännpunkten) bakom spegel → sprider ljus förminskar, rättvända bild Används: gatukorsningar, sidospeglar på bilar osv 💡Konvexa växer ut på mitten -------- Ljus bryts är när ljusstrålar byter riktning när de passerar gränser mellan 2 ämnen med olika densitet = hastighet måste ändras Tunn → tätt: Brytningsvinkel mindre än infallsvinkel(mot normalen) = hastigheten minskas EX: Luft → vatten/glass Tätt → tunn: Brytningsvinkel större än infallsvinkel(mot normalen) = hastigheten ökar EX: Vatten/glass → luft Totalreflektion: Ljus passerar tätt → tunt med tillräckligt stor infavvinkela = bryts ej utan reflekteras tillbaka(till de tätare ämnet) Utnyttjas i Fiberoptik(inom sjukvård och tv/data signaler) - tunna trådar av glas där ljussignaler skickas i genom - totalreflekteras hela tiden(studsar fram och tillbaka) Optisk fiber kan användas till: Fiberoptiska kablar(dataöverföring) med ljussignaler omvandlas elektriska signaler och tillbak till ljussignaler = Överför mycket/snabbt/längre Linser: Glass/plastbitar som bryter ljus Finns i glasögon, kameror, mikroskop osv Konvexa linser/samling linser: Buktar utåt och samlar ljusstrålar Positiv lins Ex +12 = 12 cm brännvidd Innanför bräningspunkt skapas förstorad skenbilder Utanför bräningspunkten skapas en oftas förminskas verklig bild Utanför alltid upp och nervänd (beroende på avstånd) Konkav linser/spridningslinser: Buktar inåt och sprider ljusstrålar Negativ lins Ex -10 = 10 cm brännvidd Förminskad och rätvinklig skenbilder Skenbild: Ser med ögon men finns ej i verklighet --------- Ögon har konvex lins och samlar ljus till bild på näthinnan Närsynthet: Bra nära/dåligt långt, bilden hamnar framför näthinnan Behöver konkav linser sprider ljusstrålar Över/långsynthet: Bra långt/dåligt kort, bilden hamnar bakom näthinnan Behöver konvexa linser samlar ljusstrålar --------- Ex: vitt ljus(solljus) passera genom ett tresidigt prisma delar sig ljuset Spektrum: Ljus delar sig i 7 färger(Rött, orange, gult, grönt, blått, indigo och violett) Färgerna samma och samma ordning Vitt ljus innehåller olika färger som bryt olika mytek(har olika våglängder) Rött längst vågläng(bryts minst) och violet kortast vågläng(bryts mest) Regnbåge= spektrum, ljus från solen träffar vattendroppen och sedan en själv Stå med ryggen mot solen Vattendroppar bryter och reflekterar ljus strålar från solen Att den är en båge som har att gör med vinklar När solljus träffar vissa ytor absorberas andra färger upp och reflekterar bara en färg. EX grönt löv, målarfärg Vit: reflekterar färg - Svart: absorberar färg ---------- Opolariserat ljus: Ljus som svänger i olika riktningar Polariserat Ljus: Svänger bar i en riktning, används i polaroidglasögon(släpper igenom polariserat ljus beroende på vilket håll de gå) Laserljus: Består av ljusvågor med samm våglängder Hålls mer energirik och fokuserad, eftersom strålarna bryt lika mycket Används för cacerbehnaldig, mäta avstånd(Skickar ut ljusstrålar som reflekterar och återvänder + så beräknas de med hjälp av ljuset hastighet) , ta bort tatueringar osv ------- Ljud(Akustik): Vibrationer som knuffar luftmolekyler skapar ljudvågor fångas upp av öronen → trumhinnor att vibrerar och så fångar hörselnerv up signal → hjärnan Sprid som Förtätningar (högre lufttryck → vågtoppar) och Förtunningar (lägre lufttryck → vågdalar) Färdas ej i vakuum Hastighet 340 m/s i luft - 1500 m/s i vatten (olika i olika material) Avstånd mellan 2 vågtoppar/vågdalar → en svängning/ljudvåg Amplitud: hur kraftig svängning(ljudvåg) är/hur stark ljudnivån är, mäts i decibel(dB) Frekvenser: antalet svängningar(ljudvågor)/ per sekund, mäts i hertz(Hz) Människor hör ljud mellan 20 → 20.000 Hz Infraljud: frekvens under 20 Hz, skapas/hörs flygplan, kraftiga vindar, djur kommunikation osv Ultraljud: frekvens över 20 000 Hz, hörs av djur såsom hundar Stämmas(strängar ställs in i förhållande till varandra) enkelt verktyg Stämgaffel: slår den frekvens 44o Hz = normal ton(ettstrukna a) Tonhöjd: mått på hur ljus eller mörk tonen är bestäms av ljudvågornas frekvens Tonens frekvens beror på strängens längd, tjocklek och hur spänd den är. Tunn, kort och hård spänd sträng = Ton med kort våglängd + hög frekvens = Höga och ljus toner(diskanttoner) Tjocka, lång och löst spänd sträng = Ton med lång våglängd + låg frekvens = Låga och mörka toner(bastoner) Resonans /medsvängning: ljudvågor sätter andra föremål i rörelse Förstärker ljud i akustiska instrument Resonlåda: förstärk ljud/gör tonen starkare, använd på instrument såsom fiol akustiska instrument(ljud naturligt) och elektriska instrument(ljud på elektrisk väg) Varför låter samma ton olika på olika instrument? Instrument ger övertoner(tillägsstoner) + grundton = instrument speciella klang Människans frekvensområde delas in i 8 oktaver 1 oktav = 8 huvudtoner/ 1 ton i 1 oktav har 2 gånger så hög frekvens som den förra Ultraljud: Högfrekventa ljudvågor som skapa rörliga bilder av kroppens inre organ Använd inom sjukvården, upptäcka njursten, se foster osv Ljudvågor reflekteras(studsar) mot ytor och återvänder = fördröjd upprepning av judet ↓ Efterklang: Ljud dröjer kvar i rum efter ljudkällan tystnat Eko: Tydligt upprättande av ljudet Ekolod: använder ultraljudsvågor för att mäta avstånd och avbildad undervattensmiljöer ---------- Ljudvågor fångas upp av ytterörat → trumhinnan vibrerar + förstärks av hörselben → hörselsnäckan omvandlas till elektriska signaler → hjärnan 2 öron för att kunna uppfatta vart ljud kommer från Höga ljudnivåer kan skada hörsel: Komma från, tåg, flygplan, högt ljud i lurar, bullriga byggplatser osv Kan leda till Tinnitus, hör besvärande, oavbrutet ljud som ej finns Skydda hörseln: Minska ljudnivån, använda hörselkåpor/skydd Ljudisolering: hindra ljud att passer luft genom att använd tunga täta material för att bryta vibrationer ---------------- Elektriska kretsar och elektromagnetism: Spänning: Skillnad i elektriska laddningar mellan 2 pooler/Driver strömmen Stor skillnad = högre spänning / liten skillnad = mindre spänning EX: Batter 2 poler minuspol(överskott) och pluspol(underskott) Enhet: V (volt) med voltmätare (vägguttag har 230V) Ström: Uppstår när elektroner rör sig för att jämna ut skillnader Går från minus → plus (Sägs gå från plus → minus) Skapa ljus Enhet: A (ampere) med amperemätare - mA(milliampere) 1A = 1000 mA Resistans: Ämnets förmågan att leda ström/ skapar elektrisk motstånd Elektroner svårt ta sig genom ledare Enhet: Ω (ohm) Liten resistans = strömmen stark(lättare för elektroner) Stor resistans=liten ström(Svårare för elektroner) Påverkas av 4 egenskaper Längd, temperatur, material och tjocklek Tunn, lång och hög temperatur = stor resistans Tjock kort och låg temperatur = liten resistans Ohms lag: Visar sambandet mellan ström, spänning och resistans. U = Spänning(V) R = Resistans(Ω) I = Ström (A) --------------- Atom: elektrisk neutral(lika många protoner som elektroner) Vissa atomer släpper ifrån/drar till sig elektroner Elektriska laddningar: Positiva laddningar(underskott av elektroner) Negativa laddningar (överskott av elektroner) Statisk elektricitet: Uppstår i naturen Obalans mellan elektriska laddningar/när de utjämnas, skapas av friktion(en sidan överskott och andra underskott av elektroner) EX: Åska(elektrisk fenomen) - elektrisk spänning, mellan moln och mark - Molnet(neder - negativt och över positivt) = Blixt(skillnad stor) - marken positiv(stor skillnad) = blixt slår ner + tar alltid kortaste vägen Skydd: Var ej högst punkt, var i bil(plåt) Åskledare: Uppfångare av metall (högsta punkt) - Nedledare av koppar nedåt - Jordledare av tjock koppar leder blixt i marken Athrerear: 2 olika laddningar dras till varandra Repellera 2 lika laddningar stöter bort varandra Stor elektrisk skillnad som jämnas ut = liten stöt -------------- Elektrisk krets: Är en sluten krets med ledre och komponenter(bater, lamap, strömbrytar osv) som låter ström flöda Ledare: Ledare ström, EX: metaller - silver, koppar och guld Varför metall? - fria valenselektroner = snabb transport och kan hålla värme bra Isolatorer: Leder EJ ström, EX: glas, plast porslin osv Kopplingsschema: Förenklad ritning av en elektrisk krets OBS: ström anges från plus till minus Resistorer: Ökar resistans = minskad ström Fast resistor: bästemd restitasn/Variabla resistor: variera resitsans Seriekoppling: Koplas i efter varnadra i en enda sluten krets En lamp/komponent går sönder/tas ut - fungerar resten ej Lampan: svagt ljus Spänning fördelas Batterier: Spänningen= summan av batteriets spänning - lampan starkt under kort tid Parallellkoppling: Allt kopplas till samm spänningskälla med egna kerstar Lampa/komponent ej fungera - fungerar resten fortfarande(egen sluten kerts till strömkällan) lampan: lyser stark under kort tid Lika stor spänning Batterier: Spänningen densamma - lampan svagt under lång tid ------------ Kortslutning: När strömmen tar fel väg(ström tar oftast den kortaste vägen) Ske avsiktligt eller oavsiktligt = kan leda till eldsvåda Säkringar(nya)/proppar(älder): Bryter ström när den blir för stark Löser ut = allt kopplat till den slocknar eller stannar Anledningar: Kortslutningen eller överbelastning(För många aprater till smma säkring) Ström farligt - leda till muskelsmärtor, andningsbesvär osv - Kroppen resistans avgör hur stark strömmen blir Skyddsjordade kablar: säkerhetsåtgärd finns i flest elektriska apparater 3 sladdar: n3 skyddsjordledare: kopplad till metallhölje och är gul grön randig = ströme ej går igenom kroppen - ström leds genom skyddsjordsledaren till jord Obs: För att de ska fungera måste både uttag och appart vara skyddsjordade Jordfelsbrytare: Bryter ström på bråkdelen av en sekund. -------- Energiprincipen:Energi kan inte skapas eller förstöras bara omvandlas Elektrisk energi - Strålningsenergi Värmeenergi - Kemisk energi Mekanisk energi(läges/rörelseenergi) - Kärnenergi Lätta att transporter energi (genom elnät) Nackdel: en del försvinner i form av värmeenergi samt elektrisk energi svår att lagra Elenergi i sverige kommer från Vatten, vind och kärnkraftverk Förnybara energikällor: Naturreser som ständigt återkommer, EX: vattenkraft, solenergi, vindkraft Solenergi, positivt direkt från sol, negativt dyrt installera/skapa solceller, sällsynta material → långa transporter Elektrisk Effekt(p): Hur snabbt energi omvandlas och arbete utförs Mäts i W(watt) 1W = 1 joule/s Effekt(W) = Energi(Joule)/tid(s) (elektrisk)Effekt(W) P = U(spänning) x I (Ström) Totala elektrisk förbrukning/energi = Effekt(kW) x Tid(h) = Kilowattimmar(kWh) ------------ Magnetism: Fysikaliskt fenomen, när materialen utövar attraktiva eller repulsiva krafter på andra material(magnetiska egenskaper) Magnet: Delas i 2 = 2 nya magneter med Nordände(röd) och - Sydände(vit) Magnetfält: Osynliga magnetiska fältlinjer som går från nordände - sydände Fältlinjer: Osynliga kraftlinjer Papper över magnet och strö järnspån = se magnetfält Tumregel: Ange fältlinjer riktning, ledaren i höger hand + tummen pekande i strömmens riktning = pekar de andra fingrarna i fältlinjernas riktning Kompass - nordsydlig riktning = jorden är en magnet Jordens magnetiska sydände ligger - ca jordens geografiska Nordpolen. Jorden magnetiska nordände ligga - ca jordens geografiska Sydpolen. Missvisning: Jordens magnetiska ändar är ej exakt Jordens geografiska nord- och sydpol. Magnetisk influens: Fenomen oladdat magnetiskt material blir tillfälligt magnetiskt i närheten av magnet - EX: järn(järnspik), nickel och kobolt --------- Norsken :Solen ger elektrisk laddade partiklar(solvind) →Fångas av jorden magnetfält → polerna → Kolliderar med atomer och molekyler i atmosfären → Kollision(atomer exalterad) - lugnar ner sig = energi i forma av ljus Förekommer ofta vid nord- och sydpolen eftersom där är magnetfältet starkast + färg = på typ av atom och kollision höjd -------- Växelström: Ström(elektroner) som byter ständigt riktning Likström: Ström(elektroner) har samm riktning konstant ---------- Elektromagnetism: Samband mellan magnetism och elektricitet, upptäckt av dansken Christian orstedt Elektromagnet: Magnetfältet skapta av ström led genom en spole med koppartråd lindad runt,+ en järnkärna kopplat till en strömkälla. (Spole är kopplad till en spänningskälla) Magnetism kan sättas på och av - (bryta strömmen) Styrkan kan regleras 1. Mängd varav koppartråd runt spole 2. Öka/minska strömstyrkan 3. Om innehåller en järnbit Spole: Elektrisk ledare koppartråd lindad runt plastbehållare/(järnkärna/järnspik stärker magnetfältet) Används till kraftfulla lyftkranar och svävande tåg --------- Elmotor: Omvandlar elektrisk energi → rörelseenergi Består av spole + spänningskälla(elektromagnet) och en permanent magnet Ström genom spole bilder magnetfältet → spole snurrar i magnet halva varav → byter strömriktning = Syd och nordände byts konstant Snabbare växling = snabbare spole snurrar Används till elvisp, borrmaskin osv -------- Induktion(induktionsström): Magnetfält ändras skapar ström Uppkommer: Spole rör sig i magnetfält/magnet rör sig i spole/När magnetfältet ändras genom att ledare skär i fältlinjer = ström Förstärks, varav på spole och hur snabbt magnetfältet ändras ------- Generator: Omvandlar rörelseenergi → elektrisk energi med hjälp av induktion Består av : Kopparspole och magnet Magnet roter nära kopparspole = magnetfältet i spole förändras → ström EX: Dynamo i cykel med lampa - Spole i ringformad magnet → trampar → spole snurrar i magnetfältet = ström till en lampa Stora generatorer i vind, vatten och kärnkraftverk → Magnet som snurrar i spole = ström till vägguttag Skillnad vad som får magnetent att snurra --------- Transformator: Höja eller sänka spänning Består av: Primärspole: Spänningskälla + spole Sekundärspole: Elektriska apart + spole Spole lindad runt järnkärna Fungerar bra med växelström leds i primärspolen - magnetfält ändrar riktning → påverkar sekundärspolen = ändrad induktionsspänning 💡 Primärspole tar emot ström → sekundärspole ger ut den med ändrar spänning Nedtransformering: Primärspolen har fler varv än sekundärspolen. Upptransformering: Sekundärspolen har fler varv än primärspolen. Vp - Primärspolens spänning Np - Primärspolens varv Vs - Sekundärspolen spänning Ns - Sekundärspole varv Används i laddare / för transportera elektrisk energi via elnät - upptransformering (till ca 400 000 V) annars tråden varma = förlorar energi - med nedtransformering när når städer ------------ Atom och kränsfysik: Elementarpartiklar: Fysikens minsta beståndsdelar(ex: elektroner, fotoner och kvarkar) Atomen: Minsta beståndsdelen, bygger upp all materia Atomos(odelbar) → Atom(består av mindre delar) Oldadda = Neutral (lika många elektroner som protoner) Består av: Atomkärna: Protoner(positiva) och Neutroner( neutrala) Runt om Elektroner(negativt) i Elektronskal: K-skal(max 2), L(max 8),M(max 8) osv Atomens massa samlad i kärnan: Neutron = protoner(massa) Proton 200 gg större massa som elektron Grundämnen: en sorts atom, ex syre, kol osv Atomnummer: Antalet protoner Matsal: Antal protoner + neutroner Positiv jon: Underskott av elektroner Negativ jon: Överskott av elektroner Isotoper: Varianter av grundämnen Samma atomnummer - olika masstal(skillnad i antalet neutroner) EX: vätte 3 st, 0 - 1 - 2 neutroner Nanoteknik: Ändra material på atomnivå - ändra materialegenskaper Elektromagnetisk strålning: Atomer skapar ljus Elektroner - hoppar mellan inre och yttre skal(instabil) - hoppar tillbaka(stabil) = frigörs överskottsenergi (i elektromagnetisk strålning) = Foton(Ljuspartikel, bär på energi saknar massa, färdas i ljuset hastighet) avges Kort hopp - mindre energi - Energi fattigt infrarött ljus, radiovågor Långa hopp - mer energi - Energi fullt blått ljus, Uv-ljus, Röntgenstrålning - ta röntgenbilder ---------- Radioaktivitet: Instabil atomkärnor som sönderfaller och avger strålning Upptäckt: 1896 Henri becquerel - uran/ Marie och peri cure - radium och polonium Radioaktiva ämnen: Skickar ut olika sorter strålning Radioaktiva strålning: Joniserande strålning som avges när radioaktiva atomkärnor sönderfaller Joniserande strålning: Energirik strålning som kan slår bort elektron = joner(farligt - ge cancer och används för cancerbehandling) Partikelstrålning: Alfastrålning: Alfapartikel(heliumkärna, 2 protoner och 2 neutroner) sänds ut = Nytt grundämne Stoppas av papper och hud Betastrålning: Betapartikel( neutron - en elektron och en proton) skickar ut elektron = nytt grundämne(som har + en proton) Stoppas av aluminiumplåt och träskiva Elektromagnetisk strålning: Gammastrålning: Energirik foton avges och kort våglängd = oförändrat atomnummer Stoppas av bly Halveringstid: Tiden de tar för hälften av atomkärnan att sönderfalla Ex: Kolistopen Kol-14 används för att se hur gammalt arkeologiska fynd är Aktivitet: mängd radioaktiv strålning - enheten Bq(becquerel) x = x sönderfall/per minut Geiger -Muller mätare: Mäter radioaktivitet Stråldos: mängd joniserande strålning, kropp tar upp per kilo - enheten Sv(sievert) eller millisievert Dosimetern: Registrerar samnalg mängstrålning en person utsätts för under en viss tid

MRQs 120-125 heeling magnet

🧴 1. SKIN ASSESSMENT – DETAILED NOTES 📄 ⭐ Purpose of Skin Assessment * Identify early signs of breakdown * Detect circulation or oxygenation issues * Prevent pressure injuries * Monitor healing or worsening conditions 🧠 What You Assess (Head-to-Toe Skin Check) 🔹 1. Temperature * Warm = normal * Cool = ↓ circulation * Hot = infection/inflammation 🔹 2. Color * Pallor → anemia / ↓ oxygen * Cyanosis → poor oxygenation (BLUE = BAD) * Redness → inflammation / pressure 🔹 3. Turgor * Pinch skin (usually chest or forehead) * Normal = snaps back quickly * Tented = dehydration 🔹 4. Moisture * Dry → dehydration * Diaphoretic → fever, stress * Excess moisture → breakdown risk 🔹 5. Integrity * Intact vs open areas * Look for: * wounds * tears * ulcers 🔹 6. Capillary Refill * Press nail bed * Normal = < 2 seconds * Delayed = poor perfusion 🔹 7. Edema * Swelling = fluid buildup * Check severity (pitting scale) 🚨 PRIORITY AREAS TO CHECK * Bony prominences (sacrum, heels, elbows) * Skin folds (obese patients) * Under devices (oxygen tubing, stockings) * Areas with ↓ sensation ⚠️ HIGH-YIELD FINDINGS * Non-blanchable redness = Stage 1 pressure injury * Cool, pale skin = ↓ perfusion * Moist skin = ↑ breakdown risk 🩹 2. SKIN TRAUMA & PRESSURE ULCERS – DETAILED NOTES 📄 ⭐ What is Skin Trauma? Damage to the body’s protective barrier ⚠️ Causes of Poor Wound Healing * Malnutrition * Poor blood flow * Infection * Smoking * Medications (steroids) * Age 🧬 Wound Healing Phases 1. Inflammatory * Redness, swelling * Body sends immune cells 2. Proliferative * New tissue forms * Wound starts closing 3. Maturation * Remodeling * Scar forms 👉 Know the ORDER!! 🔥 Types of Wound Healing * Primary intention → clean, closed (sutures) * Secondary intention → open wound heals slowly * Tertiary intention → delayed closure 🚨 PRESSURE INJURIES ⭐ Causes: * Pressure * Friction * Shearing ⭐ Risk Factors: * Immobility * Incontinence * Poor nutrition * ↓ mental status 🔴 STAGES (VERY TESTED) Stage 1: * Non-blanchable redness * Skin intact Stage 2: * Partial thickness * Blister / shallow wound Stage 3: * Full thickness * Fat visible Stage 4: * Muscle or bone exposed Unstageable: * Covered with slough/eschar Deep Tissue Injury: * Purple/maroon skin 🚑 INTERVENTIONS (PRIORITY CARE) * Turn every 2 hours * Keep skin clean and dry * Use barrier creams * Promote nutrition (protein!!!) * Assess skin daily ❌ DO NOT: * Massage reddened areas ⚠️ COMPLICATIONS * Infection * Dehiscence (wound opens) * Evisceration (organs out = emergency) 🧴 3. SKIN CONDITIONS – DETAILED NOTES 📄 ⭐ COMMON CONDITIONS 🔹 Dryness / Pruritus * Dry, itchy skin * Causes: * dehydration * irritants * allergies Treatment: * Moisturizers * Antihistamines * Steroids 🔹 Urticaria (Hives) * Raised, itchy welts * Blanch with pressure Treatment: * Antihistamines * Steroids * Epinephrine (severe) 🔥 Psoriasis (VERY TESTED) * Chronic autoimmune disorder Signs: * Silvery scales * Red plaques * Common areas: * elbows * knees * scalp Treatment: * Steroids * UV therapy * Biologic drugs 🔥 Cellulitis (IMPORTANT) * Bacterial infection Signs: * Red * Warm * Swollen * Painful Treatment: * Antibiotics * Elevate extremity 🔥 Shingles (VERY TESTED) * Reactivation of chickenpox Signs: * Painful vesicles * Burning/tingling Key Point: 👉 Contagious to people who never had chickenpox 🔥 Skin Cancer Types: * Basal cell * Squamous * Melanoma (most dangerous) ⭐ ABCDE RULE: * A = asymmetry * B = border * C = color * D = diameter * E = evolving 🧠 Nursing Diagnoses: * Impaired skin integrity * Risk for infection * Pain * Disturbed body image 🛌 4

Ortho 2 Exam 2 (LLAF and Shoulder) --> LLAF Conditions (heel spur and plantar fasciopathy)

Vascular Structures The circulatory system comprises blood vessels responsible for transporting blood throughout the body. The vascular structures are categorized into three types: arteries, veins, and capillaries. Understanding their functions and differences is crucial for patient care technicians. Arteries Arteries are blood vessels that carry freshly oxygenated blood from the heart to the various tissues and organs in the body. These vessels have thick walls to withstand the high pressure generated by the heart. Key Arteries to Know: * Coronary Artery: Supplies blood to the heart muscle itself. * Femoral Artery: Located in the thigh, supplying blood to the lower limbs. * Pulmonary Artery: Carries deoxygenated blood from the heart to the lungs for oxygenation. Veins Veins are blood vessels that carry deoxygenated blood from the body back to the heart. Unlike arteries, veins have thinner walls and contain valves that prevent the backflow of blood. Key Veins to Know: * Jugular Vein: Located in the neck, returns blood from the head and neck to the heart. * Saphenous Vein: A large vein running along the leg, important in procedures like varicose vein treatment. * Pulmonary Vein: Carries oxygenated blood from the lungs back to the heart. Capillaries Capillaries are the smallest blood vessels and serve as the site for nutrient, gas, and waste exchange between the blood and body cells. They are extremely permeable, allowing oxygen and nutrients to move into cells and carbon dioxide and waste products to move out. * Function: Capillaries allow the exchange of gases, nutrients, and waste products with surrounding tissues. The thin walls facilitate this process, and they play a crucial role in maintaining homeostasis. Infection Control Practices As a Patient Care Technician, it is essential to practice infection control techniques to prevent the transmission of infectious agents during patient care. This is especially critical when performing invasive procedures. Personal Protective Equipment (PPE) PPE protects both healthcare workers and patients from potential infections. Common PPE includes gloves, gowns, masks, face shields, and goggles. * Always wear appropriate PPE based on the procedure and the patient's condition. * Hand Hygiene: Wash hands thoroughly before and after patient contact and before performing procedures. Always use hand sanitizer if soap and water are unavailable. * Safe Disposal: Dispose of equipment like needles and gloves properly to prevent the spread of infection. Dispose of sharps in a sharps container immediately after use. Preventing Infection During Invasive Procedures When performing procedures such as blood draws, catheter insertions, or injections, ensure the environment is sterile. Follow these guidelines: * Sterile Technique: Ensure that all equipment is sterile before use and that the procedure area is clean. * Use of Clean Materials: Always check that materials such as gauze pads, alcohol wipes, and bandages are intact and not expired. Patient Identification and Consent Patient identification and consent are vital aspects of delivering safe care. Patient Identification To prevent errors, always verify patient identity before conducting any procedure. Use two acceptable patient identifiers (e.g., name, date of birth, medical record number). * Verification Process: 1. Confirm patient’s identity by asking for their name and date of birth. 2. Compare the patient's provided information with the information on the requisition form. Consent Before any procedure, obtain verbal or written consent from the patient. Always confirm the patient understands the procedure and consents voluntarily. Patients have the right to refuse consent for any reason, whether personal, cultural, or medical. * If a patient refuses consent, document the refusal and notify the nurse or supervising healthcare professional immediately. Handling and Safety of Medical Equipment Proper handling and safety protocols for medical equipment are critical in patient care. Always inspect equipment thoroughly to ensure its functionality and safety. Needles and Syringes * Inspection: Visually inspect needles for any burrs, bends, or defects before and after removing the cap. * Single Use Only: Needles should only be used once, even if it is for the same patient. * Deploy Safety Devices: Immediately activate the safety device after use to protect yourself and others. Place used needles in a sharps container as soon as possible. Evacuated Tubes Evacuated tubes are used for blood collection, and their integrity is crucial for obtaining accurate test results. * Expiration Dates: Always check the expiration date on the tube packaging before use. Expired tubes may not function properly. * Inspect for Cracks or Breaks: Do not use tubes with cracks, breaks, or missing labels. * Additives: Ensure that the additives in the tubes are not expired as expired additives can alter test results. * Do Not Use Without Labels: Ensure that the tubes are correctly labeled with the patient's information. Tourniquets Tourniquets are used to temporarily restrict blood flow during venipuncture. Inspect the tourniquet before use. * Inspection: Ensure the tourniquet is free of tears, rips, dirt, or contamination. * Single Use vs. Multiple Use: Some tourniquets are disposable while others are reusable. Always clean reusable tourniquets between uses. Specimen Collection and Labeling Accurate labeling and handling of specimens are crucial for diagnostic accuracy. Labeling Specimens * Label Before Leaving the Room: Always label specimens in front of the patient to ensure proper identification. * Required Information: Labels must include the patient’s full name, date of birth, date and time of collection, and the medical or facility identification number. * Placement of Labels: Place the label over the preprinted label and ensure that the stopper is not covered. Be careful to avoid creases or wrinkles on the label. * Do Not Allow Others to Label: Never allow someone else to label your specimens, and do not label for others. Handling of Requisition Forms * Verification: Always verify that the requisition form matches the patient’s information and the test ordered. * Documentation: Ensure that any discrepancies are resolved before proceeding with specimen collection. Key Points * Vascular structures: arteries (e.g., coronary, femoral, pulmonary), veins (e.g., jugular, saphenous, pulmonary), and capillaries are essential for circulatory functions. * Infection control is vital in all patient care tasks, including the use of PPE, hand hygiene, and safe disposal of contaminated materials. * Always confirm the patient’s identity and obtain consent before performing procedures. * Inspect needles, tubes, and tourniquets for defects to ensure patient safety. * Properly label and handle specimens to prevent errors and ensure accurate test results. Dermal Punctures Dermal punctures are blood collection procedures that involve the puncturing of the skin’s surface to collect a smaller amount of blood, typically for diagnostic purposes. This method is commonly used when only a small sample is required or when venous access is difficult. * Alternative Names: Dermal punctures are sometimes called heel sticks, finger sticks, or capillary puncturesdepending on the patient’s age and the area from which blood is drawn. * Comparison with Venipuncture: Dermal punctures remove smaller amounts of blood compared to venipuncture, which involves drawing blood from veins. Dermal punctures are less invasive and are typically used when only a small sample is needed for testing. Indications for Dermal Puncture Dermal punctures are useful in various clinical scenarios. It’s essential to understand when and why dermal punctures are preferred over other methods of blood collection: * Small Amounts of Blood: Dermal punctures are used when only a small amount of blood is required, such as for point-of-care tests like glucose monitoring, cholesterol checks, and hematocrit levels. * Inaccessible Veins: In cases where veins are not easily accessible, such as with infants, elderly patients, or patients with specific medical conditions, dermal punctures provide an alternative solution. * Capillary Blood Required: Some laboratory tests require capillary bloodbecause it offers a mix of arterial, venous, and capillary blood, which can provide different insights into a patient’s health. * Risk of Iatrogenic Anemia: Dermal punctures are also preferred in cases where multiple blood draws could lead to iatrogenic anemia, particularly in infants, as they have a smaller blood volume and are more at risk of developing anemia from repeated venipunctures. * Common Uses for Point-of-Care (POC) Tests: Dermal punctures are often used for point-of-care tests (POC), which are rapid tests performed at or near the site of patient care. Common POC tests include: * Glucose: Blood sugar testing for diabetes management. * Cholesterol: Monitoring cholesterol levels to assess cardiovascular health. * Hematocrit: Assessing the percentage of red blood cells in blood. Dermal Puncture in Infants and Children Dermal punctures are commonly performed on infants younger than 1 year old due to the following reasons: * Less Blood Required: Infants require much smaller blood samples, and dermal punctures provide an easy way to collect blood without the need for large quantities. * Avoiding Damage to Blood Vessels: Repeated venipuncture in infants can damage their fragile veins and blood vessels. Dermal punctures reduce this risk and provide an effective alternative. * Preferred Sites for Infants: Heel sticks are the most common method used for infants, and the preferred sites are the medial or lateral sides of the plantar surface of the heel. Blood Composition in Dermal Punctures When performing dermal punctures, it’s important to understand the composition of the blood being collected. Dermal puncture blood specimens contain three types of blood: * Arterial Blood: Blood that is rich in oxygen and comes from the arteries. * Capillary Blood: Blood that comes from the capillaries and reflects a mixture of arterial and venous blood. * Venous Blood: Blood that is deoxygenated and returns to the heart from the body. Important Note: Because dermal punctures involve a mix of these three types of blood, it’s essential to document on the requisition form that a dermal puncture was performed, as the composition differs from that of venous blood, which may affect test results. Performing Dermal Punctures on Adults and Children For adults and children older than one year, finger sticks are commonly performed. Below are detailed instructions on how to perform a finger stick correctly: Finger Stick * Preferred Site: Perform the finger stick on the third or fourth finger of the patient’s non-dominant hand. * Site Selection: Choose the fleshy, off-center side of the finger to avoid nerves and bones. * Avoid Certain Fingers: Never perform finger sticks on fingers that are: * Cold * Cyanotic (bluish discoloration) * Scarred * Swollen * Rash-covered * Wipe the First Drop: After making the puncture, wipe away the first drop of blood because it may contain tissue fluid or contaminants that could affect test results. * Collect the Second Drop: Use the second drop of blood for the collection to ensure a clean sample. * Lancet Insertion: Insert the lancet at a 90-degree angle (perpendicular to the fingerprint) to ensure the proper depth of puncture. Heel Stick (For Infants) * Preferred Site for Heel Stick: The medial or lateral sides of the plantar surface of the heel are the best sites for performing a heel stick. Avoid the back of the heel because it may damage sensitive structures. * Warm the Heel: Apply a heel warmerfor 3 to 5 minutes before performing the procedure. This helps to increase blood flow to the area and makes the blood easier to collect. * Wipe the First Drop: Similar to finger sticks, wipe away the first drop of blood to ensure accurate collection from the second drop. Key Points * Dermal punctures are ideal when a small sample of blood is needed, when venous access is difficult, or when point-of-care tests are required. * For infants and children under 1 year, dermal punctures, especially heel sticks, are the best option due to the limited blood volume and the risk of damaging their veins. * Finger sticks for adults and children over 1 year old should be performed on the third or fourth finger of the non-dominant hand. * Lancet insertion should be done at a 90-degree angle to the fingerprint. * Always wipe away the first drop of blood to avoid contamination and collect the second drop for the test. * For heel sticks, apply a heel warmer for 3 to 5 minutes to improve blood circulation in the infant’s foot. Safety and Comfort During Blood Collection * The primary goals during blood collection are to ensure patient safety, provide comfort, and obtain specimens efficiently and effectively.  Patient Positioning * Never perform venipunctures with patients standing or sitting on a high stool or the edge of an examination table. * The optimal position for venipuncture is for the arm to be fully extended with the palm facing upward. Venipuncture Site Selection * Begin by palpating the veins in the antecubital area. * First Choice: Median cubital vein (preferred due to its size and location). * Second Choice: Cephalic vein (often accessible and fatty). * Third Choice: Dorsal hand vein (smaller and less ideal). * Last Choice: Basilic vein (close to the radial nerve and brachial artery, making it riskier to puncture). * The ideal vein for venipuncture should be well anchored, feel spongy and bouncy, and should be straight and easy to access with a needle. Special Considerations * Avoid collecting blood from the arm on the affected side of a patient who has had a mastectomy. * Do not perform collections in any area with tattoos, as this can influence results. * Avoid collecting blood through a hematoma, as it can alter results and cause pain. * Steer clear of areas with edema, as collection may yield excess fluid and discomfort for the patient. * Do not collect blood from scarred areas, as access may be difficult and painful. * Avoid sclerotic veins, as blood flow may be inadequate, making collection painful. Tourniquet Application * Apply a tourniquet 3 to 4 inches above the antecubital area or above the wrist bone. * The tourniquet must be removed within one minute of application to prevent hemoconcentration. Preparation for Venipuncture * Allow the alcohol to dry completely before performing venipuncture; do not fan or blow on it to speed up the drying process. * Insert the needle until you feel a change in resistance (indicating entry into the vein). Stop insertion once this is felt. Blood Collection Techniques * The most common method for venipuncture is the evacuated tube system. * Equipment needed includes: * Gloves * Isopropyl alcohol swabs or pads * Gauze pads * Tape * Self-adhesive wrap or adhesive bandages * Tourniquet * Needles * Hub adapter or needle holder * Blood collection tubes * Always check tubes for additives, expiration dates, and the amount of blood they can hold. * Common additives are anticoagulants or clot activators. Angles for Needle Insertion * For antecubital area: Insert the needle at a 15 to 30-degree angle. * For hand collection: Insert the needle at a 10-degree angle. Special Collection Devices * Winged Infusion Devices: Used for patients with small or difficult veins, primarily on the dorsal hand vein. * Syringe Method: Utilized for patients with fragile veins that can easily collapse; this method allows for controlled and adjustable blood withdrawal, minimizing the risk of vein collapse. Importance of Urine Specimens * One of the most commonly performed diagnostic tests involves urine specimens. * Urinalysis includes examining: * Appearance * Color * Odor * pH * Specific gravity * Presence or absence of protein, glucose, or hemoglobin. Urine Culture * Urine culture tests are performed for the growth and identification of microorganisms. Types of Urine Specimen Collections: * Random Collection: * The most common urine test. * Can be done at any time without restrictions or preparations. * First Morning Urine Specimen: * Instruct the patient to urinate before going to bed. * Collect the first urination when they wake up. * Timed Urine Specimen: * Provide a rigid, light-resistant container with a capacity of about 3000 mL and a wide-mouth, leak-proof screw-on cap. * 24-Hour Collection: * The patient begins at a specific time and collects all urine until the same time the next day. * If a patient forgets or discards any urine, they must start the process over. Specialized Urine Tests: * Glucose Tolerance Test: * Requires fasting for a specific duration. * Typically collected at the same time as a blood collection and done every 1 to 2 hours. * Postprandial Test: * Patient urinated, then eats a meal. * Collect a urine sample 2 hours after eating. * Clean Catch Midstream: * Patient should urinate a little, stop, and then collect the sample before completing urination. * Important Note: Never use alcohol, hydrogen peroxide, or iodine to clean the genitals prior to collection. Reagent Strips and Urinalysis Results * Reagent strips provide information about: * pH * Specific gravity * White blood cells * Hemoglobin * Ketones * Bilirubin * Glucose. * Expected Ranges: * pH: 4.6-8.0 (ideal around 6.0). * Specific gravity: 1.005-1.030 (typically around 1.010-1.025). Other Types of Specimens: * Saliva Specimens: Used for hormone, alcohol, and drug levels. * Sputum Samples: * Mucus and secretions from the lungs and trachea. * Should be collected first thing in the morning before brushing teeth or eating/drinking. * A sample should be about 1 to 2 teaspoons. * Fecal Specimens: Used to test for bacterial infections, parasites, or occult blood. Ensure urine is not present in the fecal sample. * Semen Specimens: * Used for sperm counts, fertility assistance, and identity proof in rape cases. * Keep samples warm and protect them from light. * Throat Swabs: Culture specimens that help identify strep throat. * Wipe both tonsils, the throat, and any inflamed/infected areas. * Buccal Swab: Swabs the inside of the cheek to collect the patient’s DNA. Introduction to Blood Cultures Blood cultures are laboratory tests designed to detect bacteria or other microorganismspresent in the bloodstream. The primary goal of this test is to identify infections caused by bacteria or fungi, which can lead to serious health complications if not treated promptly. Purpose of Blood Cultures Blood cultures are used to: * Diagnose Infections: Providers request blood cultures when they suspect that a patient has a bloodstream infection, which could be caused by bacteria, fungi, or other pathogens. This helps doctors determine the exact cause of the infection so they can select the appropriate treatment (e.g., antibiotics or antifungals). * Identify the Causative Microorganisms: Blood cultures allow laboratories to grow and identify microorganisms from the patient’s blood, which can be critical in diagnosing conditions like sepsis, endocarditis, or infections originating from other parts of the body. How Blood Cultures Work 1. Specimen Collection: Blood is drawn from the patient’s vein. The sample is then placed into specialized blood culture bottles. 2. Incubation: The blood is cultured in a laboratory, meaning it is placed in dishes or bottles containing a growth medium. This medium promotes the growth of microorganisms present in the blood. 3. Observation: The blood culture bottles are observed over a period of time to see if any microorganisms begin to grow. This growth indicates the presence of an infection-causing microorganism. 4. Identification: Once growth is detected, laboratory technicians further analyze the sample to identify the specific microorganism. This allows them to determine what type of infection the patient has, which informs treatment decisions. Collection of Blood Cultures When collecting blood for culture, it is essential to follow proper procedures to ensure that the sample is accurate and uncontaminated. Site Selection and Preparation The site of collection plays a crucial role in obtaining a quality blood culture sample. Contamination can lead to inaccurate results, so it is essential to follow proper protocols for disinfecting the collection site. * Disinfection of the Collection Site: To prevent contamination from skin microorganisms, the collection site must be disinfected thoroughly before drawing blood. Follow your facility’s guidelines, but generally, the site should be cleaned for 30 to 60 seconds. * Disinfecting Procedure: 1. Use an alcohol-based antiseptic(e.g., chlorhexidine or iodine) to clean the site. 2. Scrub the area in a circular motionstarting from the center and working outward. 3. Allow the disinfectant to air dry to ensure its effectiveness. * Proper Technique: Always disinfect the site just before collecting the blood culture to avoid introducing any microorganisms that may be present on the skin. Blood Culture Bottles You will need to use two bottles for each blood culture collection: one for aerobic bacteria (which need oxygen to grow) and one for anaerobic bacteria (which grow in the absence of oxygen). * Aerobic Bottle: This bottle contains a growth medium that supports the growth of microorganisms that require oxygen. It is used for collecting blood samples that may contain aerobic bacteria. * Anaerobic Bottle: This bottle supports the growth of bacteria that thrive without oxygen. It is essential for collecting samples that may contain anaerobic bacteria. Both bottles are typically marked with color codes or labels indicating which type of microorganism they are designed to cultivate. Blood Volume and Timing * Amount of Blood: A set of blood cultures typically requires a specific volume of blood to be collected. This ensures that enough material is present for the laboratory to perform the necessary tests. Always follow the instructions from the lab or facility for the required volume. * Multiple Sets: In some cases, multiple sets of blood cultures may be needed for accurate diagnosis, especially in cases of suspected sepsis or other severe infections. * Timing: Blood cultures should be collected before starting antibiotics, as antibiotics can kill the microorganisms in the blood and interfere with the culture results. If antibiotics are already being administered, notify the laboratory, as this can affect the accuracy of the results. Guidelines for Blood Culture Collection Labeling and Documentation * Accurate Labeling: Label the blood culture bottles with patient identifiers, such as the patient’s name, date of birth, and medical record number, to avoid mix-ups. * Documenting the Collection: Always document the following information on the requisition form: * The site from which the blood was collected. * The time of collection. * The collection method (whether it was an aerobic or anaerobic sample). * Notify the Laboratory: If there are any unusual circumstances (such as suspected contamination), make sure to notify the laboratory so they can take appropriate precautions when handling the sample. Special Considerations Blood cultures are a critical diagnostic tool, and as a Patient Care Technician, it is important to understand the procedures and the potential consequences of improper collection. Infection Prevention * Always use sterile equipment and maintain a clean technique throughout the blood culture collection process. * Wear gloves and follow standard infection control protocols, including wearing appropriate PPE (personal protective equipment) to protect both yourself and the patient from cross-contamination. Handling and Transporting Blood Cultures * After collection, make sure to transportthe blood culture samples to the laboratory as soon as possible. * Avoid delays in transporting blood cultures to the lab, as prolonged exposure to room temperature can affect the growth of microorganisms. * Follow your facility’s guidelines for sample transport to ensure that the blood culture samples reach the laboratory in optimal condition. Key Points * Blood cultures are used to detect microorganisms (e.g., bacteria, fungi) in the blood and are critical in diagnosing infections such as sepsis and endocarditis. * Proper site disinfection (30-60 seconds) before collection is essential to avoid contamination and ensure accurate results. * Always collect one set of blood culture bottles per collection: one for aerobicand one for anaerobic microorganisms. * Multiple sets may be required, and blood cultures should be collected before administering antibiotics for the most accurate results. * Accurate labeling and documentationare vital to ensure proper identification and handling of specimens. * Handle and transport blood culture samples promptly and follow infection control protocols to maintain a sterile environment. Phlebotomy Overview Phlebotomy is the process of obtaining a blood sample from a patient, usually through a venipuncture (insertion of a needle into a vein). This is a common procedure performed in medical settings, and as a PCT, you may be asked to assist with or directly perform this task. The following is a breakdown of important steps and safety protocols: * Preparation: Ensure you have all necessary equipment, including gloves, gauze, alcohol swabs, bandages, and blood collection tubes. * Patient Identification: Always confirm the patient's identity to ensure correct specimen collection. * Technique: Be aware of the anatomy and correct venipuncture sites, including the antecubital fossa (area inside the elbow) and dorsal veins on the hand. Pressure on the Puncture Site After collecting the blood sample, it is criticalto apply appropriate pressure to the puncture site to stop the bleeding and prevent hematoma formation. A hematoma is a localized collection of blood under the skin, which can happen if both walls of the blood vessel are pierced during a venipuncture. * Pressure Application: Make sure to hold pressure on the puncture site for several minutes to stop the bleeding. Ensure the patient maintains the pressure to minimize the risk of bruising. * Bandage Application: Once the bleeding has stopped, a bandage should be placed on the puncture site. Observing for Complications Following a venipuncture, it is essential to monitor the patient for any complications that may arise. While most procedures are safe, complications can occur, and early identification is crucial for the patient's safety. Monitor the patient for the following complications: * Color Changes: Observe for any changes in the patient’s skin color, particularly signs of paleness or discoloration. * Diaphoresis: Excessive sweating could indicate nausea, syncope, or a panic attack. * Dyspnea or Shortness of Breath: This could signal respiratory distress and must be reported immediately. * Confusion: A change in mental status can indicate complications like shock or hypoxia. Complications of Phlebotomy It is important to understand the various complications that can arise during phlebotomy procedures. Some of these may be minor, while others could indicate more serious issues. Below is a comprehensive list of potential complications you may encounter: 1. Nerve Damage * Although rare, nerve damage can occur during venipuncture. The patient may report a sensation of numbness or a pin-and-needles feeling at the puncture site. If the patient experiences these symptoms, it is important to stop the procedure immediately and inform the nurse or supervisor. 2. Hematoma * A hematoma is a common complication, resulting from the rupture of the blood vessel wall during venipuncture. It is characterized by a localized blood collection under the skin. To minimize hematoma formation, ensure you apply adequate pressure to the puncture site after the procedure. 3. Infection * Infection is a risk with any invasive procedure, although it is rare in venipuncture. It is important to follow sterile procedures to reduce the likelihood of infection. If an infection develops, it may present as redness, swelling, or warmth around the puncture site. 4. Phlebitis * Phlebitis is inflammation of the vein, often caused by repeated use of the same vein. It may present with signs of warmth, tenderness, and redness around the puncture site. This condition is uncommon but requires attention to prevent further damage to the vein. 5. Petechiae * Petechiae are small red or purple spots on the skin. They can occur due to the rupture of small blood vessels under the skin. Though unpleasant and upsetting for the patient, petechiae are generally not dangerous and will resolve on their own. 6. Thrombus (Blood Clot) * A thrombus or blood clot can form if adequate pressure is not applied to the venipuncture site. It is essential to ensure that the patient applies sufficient pressure after the procedure to prevent clot formation. Other Reactions and Symptoms While performing venipuncture, it is important to be aware of the following minor to severe reactions that may occur: * Dizziness * A common minor physical reaction, dizziness usually resolves without treatment within a few minutes. Encourage the patient to rest and monitor for any additional symptoms. * Syncope (Fainting) * Syncope is uncommon but can occur during a venipuncture, especially in patients who are anxious. In rare cases, the patient may fall or suffer a more serious complication like an arrhythmia or stroke during the syncopal episode. * If a patient experiences syncope, lay them down and elevate their legs. Call for help immediately and stay with the patient until assistance arrives. * Nausea * If a patient feels nauseated before the blood collection, wait a few minutes before proceeding. Ensure the patient is not left alone. Use a cold compress on the patient's head or the back of their neck, provide a wet cloth to clean their mouth, and offer a glass of water if the patient vomits. Inform the nurse of the situation. * Diaphoresis (Excessive Sweating) * Excessive sweating can signal nausea, syncope, or a panic attack. Ask the patient how they are feeling, provide a tissue or towel, and ensure the patient is not left alone. Observe the patient for any further signs of complications and notify the nurse immediately. * Seizure * If the patient has a seizure during the procedure, stop the procedure immediately and seek emergency assistance. Do not attempt to restrain the patient. Remove any objects from the area that could harm the patient and stay with them, providing as much privacy as possible. * Shock * Symptoms of shock include cold, clammy, and pale skin, rapid pulse, increased shallow breathing, and a blank stare. If you suspect shock, call for help immediately. Ensure the patient has an open airway and, if they are laying down, lower their head below the body. Keep the patient warm and safe until help arrives. Key Points * As a PCT, your primary responsibility is to ensure patient safety and comfort during venipuncture. Always monitor for complications and be ready to take action if any adverse reactions occur. * Familiarize yourself with the common complications and learn how to handle them appropriately. Remember, your role may not involve diagnosing or treating these complications, but you are responsible for reporting any signs of trouble to your supervisor or healthcare provider. * Effective communication with the healthcare team is crucial. If you notice something unusual during the procedure, always report it immediately to the appropriate person. Importance of Specimen Handling, Packaging, and Communication The delivery process of laboratory specimens must be precise to ensure the accuracy of test results. Every step in the specimen handling process plays a significant role in maintaining the quality of the sample and in complying with established protocols. * Adequate Specimen Handling: Specimens should be handled with care to avoid contamination, degradation, or incorrect results. Proper techniques ensure that the samples remain intact and viable for testing. * Packaging and Communication: Proper packaging is critical to prevent spillage, contamination, or loss during transport. The communication of specimen details (e.g., patient ID, collection time, and test type) ensures that laboratory personnel can accurately process the sample. Always label specimens immediately after collection. Temperature-Specific Specimen Handling Certain tests require that specimens are maintained at specific temperatures to preserve their integrity until they reach the laboratory. * Heat Sources and Ice Slurries: Specimens that require specific temperature handling should be kept in appropriate temperature conditions immediately after collection. Common temperature controls include: * Heat Block or Heat Source for maintaining warmth. * Ice Slurry or Refrigerator/Freezer for cold storage. * Some tests require specific temperature handling as detailed below: * Ammonia and Lactic Acid: These blood samples must be placed in an ice slurry immediately after collection to maintain their stability. * Cold Agglutinins: These samples should remain at body temperature (37°C) during transport and testing to prevent interference with test results. * Bilirubin and Folate Levels: To protect blood samples from light, wrap the collection tube in foil to prevent degradation due to photosensitivity. * Blood Gas Tests: For these tests, store specimens at room temperature for 15 to 30 minutesor in an ice slurry for up to 1 hour. * Coagulation Tests: Analysis should be performed within 1 hour of specimen collection to ensure accurate results. * Photosensitive Specimens: Always protect specimens that are photosensitive, such as those for bilirubin or folate, from light to avoid changes in their composition. Timed Tests and Proper Labeling Timed Tests: Ensure the patient has fulfilled the necessary requirements for the test timing. Timed tests are critical for conditions where the concentration of the substance being tested varies over time (e.g., glucose, cortisol, etc.). * Labeling of Specimens: Label every collection container immediately after collection to prevent errors: * Patient's full name and identification number * Date and time of collection * Specimen type * Clear labeling ensures that the sample can be accurately tracked, preventing mix-ups or delays in processing. Urine Specimen Handling Urine specimens are often collected for analysis and must be handled with specific care to ensure accurate results. * Glove Use: Always wear gloves when handling patient-collected nonblood specimens to reduce the risk of contamination. Change gloves between handling each specimen to prevent cross-contamination. * Refrigeration: If a urine specimen is not going to be tested immediately, it should be refrigerated to preserve its composition and prevent bacterial growth. The specimen should be delivered to the laboratory within 1 hour of collection. * Room Temperature for Certain Tests: Some urine tests are best performed at room temperature, so verify whether immediate refrigeration is necessary. * Transferring Specimens: To transfer urine from a collection container to a transport container, use a disposable pipette or carefully pour the urine into the tube after removing the stopper. Always avoid contamination when transferring the sample. * Preserved Urine Specimens: For urine specimens that have been preserved with chemicals, keep the tubes at room temperature for no longer than 72 hours before performing a urinalysiswith chemical reagent strip testing. * Culture and Sensitivity Tests: Specimens for culture and sensitivity testing should also be kept at room temperature for up to 72 hours before analysis. Specimen Delivery Methods When specimens are ready for transport, they must be delivered to the laboratory using safe and efficient methods to prevent degradation or contamination. * Plastic Biohazard Bags: Always place specimens in biohazard bags with zipper seals to prevent spillage and to clearly communicate that the contents are biologically hazardous. Ensure that the specimen is adequately secured before transport. * Hand Delivery: In some cases, specimens may need to be delivered directly to a reference laboratory. When hand-delivering specimens: * Follow the timeliness of delivery guidelines. * Complete necessary log-in processes to track the sample's arrival. * Use proper carrying devices (e.g., coolers, bags) to prevent damage during transport. * Pneumatic Tube Systems: Commonly used in inpatient settings, pneumatic tube systems offer enhanced mechanical reliability and increased transport distance and speed. These systems also feature specific control mechanisms and shock-absorbing features to prevent hemolysis (destruction of red blood cells) during blood specimen transport. * Automated Carrier Systems: Automated transport systems use motorized containers and share many of the same features as pneumatic tube systems. These systems help streamline the transport process while maintaining the integrity of the specimens. Introduction to the Clinical Laboratory Improvement Act (CLIA) The Clinical Laboratory Improvement Act (CLIA) is a U.S. federal law that was passed in 1988. The purpose of CLIA is to regulate laboratory testing to ensure that patients receive accurate and reliable test results. CLIA sets specific standards for laboratories performing tests on specimens collected from humans, ensuring that patient care meets safety and accuracy standards. As a Patient Care Technician (PCT), you will be responsible for performing certain laboratory tests that fall under CLIA-waived procedures. These are tests that the CLIAdeems to carry a low risk for patient harm, often due to the simplicity of the procedure and the type of specimens involved. These tests are common in both medical facilities and patients' homes. CLIA-Waived Procedures CLIA-waived tests are defined as those that: * Present a minimal risk to the patient. * Involve small amounts of blood or easily collectable specimens (such as urine). * Are simple and easy to perform, which reduces the potential for error and harm. These tests include commonly performed procedures such as: * Urine dipstick tests * Glucometer tests * Pregnancy tests * Hemoglobin A1C tests Key Responsibilities in CLIA-Waived Testing When performing CLIA-waived tests, there are specific procedures you must follow to ensure the accuracy and safety of the test. Below is an outline of the key responsibilities you have when performing these tests. Confirming Written Test Requests Before performing any test, confirm that you have received a written test request from the healthcare provider. This request ensures that the test being performed is necessary and appropriate for the patient's care. Establishing Patient Identification Accurate patient identification is crucial. Always verify that the patient is the correct individual by using at least two unique identifiers, such as their full name and date of birth, before collecting any specimen. Providing Pretest Instructions Some tests require specific instructions for the patient to follow before the test. It is your responsibility to provide the patient with clear pretest instructions and ensure that the patient understands and follows them. Afterward, verify with the patient that they followed the instructions correctly. Collecting Specimens Specimens should be collected according to the package insert instructions provided with the test kit. Always make sure you are using the correct specimen collection method and tools for the test. Pay attention to the recommended procedure to avoid sample contamination. Labeling Specimens Accurately Accurate labeling of specimens is essential to prevent misidentification and errors. Label specimens immediately after collection with the patient's name, identification number, date and time of collection, and specimen type. Avoiding Expired Reagents or Test Kits Using expired reagents or test kits can lead to inaccurate results. Always check the expiration date on the test kits and reagents before use. Never use any kit or reagent that has passed its expiration date. Performing Quality Control Testing Before performing patient tests, you must perform quality control testing using the control solutions provided in the test kit. Quality control tests ensure that the testing equipment and reagents are working correctly. * Correcting Problems: If a problem is discovered during the quality control testing, resolve it before testing patient samples. If the control results are not within the acceptable range, investigate the issue, and perform corrective actions. * Frequency of Quality Control Testing: Your facility should have policies in place for the frequency of quality control testing. Follow these policies to ensure consistent accuracy in testing. Test Timing Recommendations Each test has specific timing guidelines that must be followed carefully. The timing recommendations are typically included in the package insert for the test. Follow the instructions to ensure that the test is performed accurately. Interpreting Test Results After performing the test, interpret the results by referring to the package insert information. Always be aware of the normal ranges and the specific steps to interpret the results. Recording and Reporting Test Results Once you interpret the test results, it is your responsibility to record them accurately and report them to the healthcare provider in a timely manner. Ensure that you document the results clearly and communicate any abnormal findings immediately. Follow-up or Confirmatory Testing If a test result indicates the need for follow-up or confirmatory testing, make sure to follow the package insert recommendations. You may need to communicate with the healthcare provider to discuss next steps. OSHA Regulations and Biohazardous Waste Disposal When performing any medical testing, it is essential to follow OSHA regulations for the safe disposal of biohazardous waste. This includes disposing of used test strips, gloves, and other materials in appropriate biohazard containers to minimize the risk of contamination or infection. * Biohazardous Waste Disposal: All materials that come into contact with blood, urine, or other bodily fluids should be disposed of in red biohazard bags or sharps containers as appropriate. Always follow your facility's protocol for waste disposal. Participation in Quality Assurance Programs You are responsible for participating in quality assurance and quality assessment programs for every test you perform. These programs are designed to ensure that testing is done accurately and that standards are continuously met. * Reviewing Performance: You will regularly review test results, quality control data, and procedures to assess whether improvements are needed. * Corrective Actions: If quality issues arise, corrective actions should be implemented promptly to ensure that the testing process remains reliable and safe. Glucometer Test Controls One of the most common CLIA-waived tests you will perform is blood glucose testing using a glucometer. For accurate results, you must always follow the correct procedures when performing these tests. Performing Liquid Controls * Liquid controls should be used every time you open a new package of glucometer test strips. * Use liquid controls at room temperature and ensure they are within the expiration date. Logging Test Control Results * Log the time and date of control testing, as well as the serial number of the glucometer you used. This will ensure traceability and consistency in testing. Proper Storage of Test Strips * Store glucometer test strips at room temperature and close the packageafter each use to keep the strips dry. * Ensure that test strips are not exposed to extreme temperature changes or moisture. Cleaning the Glucometer * After each use, clean the glucometerwith an alcohol wipe to remove any contamination and maintain the accuracy of the device. Preanalytical Errors Preanalytical errors are mistakes that occur before the analysis of a specimen in the laboratory. These errors can lead to inaccurate test results and affect patient care. As a PCT, your responsibility is to minimize these errors by following best practices during specimen collection and handling. Preanalytical errors can occur in several stages, including: * Specimen collection (e.g., improper technique, wrong site) * Specimen handling (e.g., incorrect transportation, improper mixing) * Specimen labeling (e.g., incorrect or missing patient information) By ensuring proper technique and avoiding common mistakes during the preanalytical phase, you can help ensure accurate and reliable test results. Factors Affecting Specimen Collection Several physiological and environmental factors can affect specimen collection. Understanding these factors helps minimize preanalytical errors: Veins and Skin Conditions * Sclerotic veins (hardened veins) and scarred skin can make venipuncture more difficult. If the veins are sclerotic or the skin is scarred, always find another site to collect the specimen. Stress * Stress can cause physiological changes, such as an elevation in white blood cells, decreased iron levels, and abnormal hormone levels, which may affect test results. Ensure the patient is relaxed before drawing blood whenever possible. Other Considerations * Menstrual cycle: Blood tests may be affected by a patient's menstrual cycle, potentially altering results such as hormone levels. * Edema: Swelling or edema in the arms can make it difficult to find veins and may affect the specimen. * Medications: Certain medications can influence test results, so it is important to know what medications the patient is taking. * Infections and vomiting: Both can impact blood chemistry and overall health, leading to unreliable results. * Pregnancy: Pregnancy can alter various lab values, including hormone levels and other metabolic markers. Preventing Hemolysis During Collection Hemolysis occurs when red blood cells are broken open, releasing hemoglobin into the plasma. This can interfere with many lab tests, leading to inaccurate results. It is essential to follow specific guidelines to avoid hemolysis. Key Practices to Prevent Hemolysis: * Tourniquet Use: Leaving a tourniquet on the patient’s arm for more than 60 seconds can cause hemolysis. Always apply the tourniquet briefly and release it before collecting the specimen. * Alcohol Application: Allow alcohol to dry completely before performing venipuncture. Alcohol can cause hemolysis if not given enough time to evaporate. * Needle Gauge: Use an appropriate gauge needle for the patient. A needle that is too small can cause hemolysis due to the force applied during blood draw. Best Practices for Collection and Handling Dermal Puncture: * Forceful squeezing or milking during a dermal puncture can lead to hemolysis and contamination of the sample. Always perform the puncture gently and avoid squeezing the puncture site. * Vigorous Mixing: Avoid vigorous mixing of collection tubes as it can also cause hemolysis. * Syringe Transfers: When transferring blood from a syringe to a tube, do not push the plunger forcefully. This can damage blood cells and lead to hemolysis. Specimen Transport: * Gently Handle Specimens: Always handle specimens gently during transport to avoid physical damage, which could lead to inaccurate results. * Avoid Freezing or Thawing: Do not allow specimens to freeze or thaw during transport, as this can alter the composition of the specimen. * Correct Order of Draw: Ensure that you follow the correct order of draw when collecting specimens from the patient to avoid cross-contamination between tubes. Mixing and Transferring Specimens: * Always mix each tube properly after removing it from the tube holder to ensure thorough mixing of the blood with the additive. * Transfer specimens promptly from syringes to evacuated tubes to prevent clotting. * Use Tubes with Valid Expiration Dates: Always check that the tubes used have not expired. Air Purging in Winged Infusion Sets: * Purge the air out of the winged infusion set by using discard tubes, especially when filling light blue top tubes, to avoid air bubbles that could interfere with test results. Removing Tubes at the Fill Level: * Remove tubes from the holder as soon as the blood reaches the fill level to avoid overfilling, which could alter the results. Proper Technique for Minimizing Clotting in Dermal Punctures Dermal punctures are typically used for capillary blood draws (such as fingerstick or heel stick samples). Proper technique is essential to minimize clotting: * Minimize Clotting: Avoid excessive pressure or manipulation at the puncture site to reduce the chance of clotting. * Correct Tube Selection: Make sure you use the correct tube for dermal puncture collections to avoid clotting or interference with the test. Understanding and Interpreting Requisitions Accurate interpretation of test requisitions is vital for collecting the correct specimen. You must: * Correctly interpret requisitions to ensure that you are collecting the correct type of specimen for the ordered tests. * Ensure correct labeling with patient details (name, identification number, time of collection, etc.) and accurate specimen information to avoid errors. Special Considerations for Light and Temperature-Sensitive Specimens Some specimens are light-sensitive or require specific temperature conditions to remain stable: * Protect light-sensitive specimens(such as bilirubin and folate) by wrapping them in foil to avoid degradation due to exposure to light. * Store temperature-sensitive specimens (such as blood gas tests) in specific temperature conditions (e.g., room temperature for 15 to 30 minutes or in an ice slurry for up to an hour). Alcohol as an Antiseptic During specimen collection, follow the manufacturer's instructions on the use of alcohol as an antiseptic. In some cases, alcohol may not be recommended, as it could affect the sample. Always ensure that you are following the correct antiseptic procedure for the specific test being performed. Labeling Specimens Accurate labeling of specimens is one of the most crucial steps in preventing errors: * Label specimens immediately after collection with the patient's name, identification number, date and time of collection, and specimen type. * Ensure that the label is legible and that all required information is present. CLSI Order of Draw The Clinical and Laboratory Standards Institute (CLSI) provides guidelines for the correct order of draw during specimen collection. The correct order of draw minimizes the risk of contamination and cross-reactivity between different additives in the tubes. The order is as follows: 1. Blood culture bottles 2. Light blue stopper 3. Red stopper serum tubes 4. Orange rapid serum tubes 5. Green stopper 6. Lavender stopper 7. Pink stopper 8. Gray stopper Chain of Custody The chain of custody refers to the process of maintaining control and accountability for every specimen from the moment it is collected until it is disposed of or reaches its final destination (e.g., testing or analysis). The chain of custody ensures that the specimen is not tampered with during transportation or storage, which is particularly crucial for legal and forensic purposes. A well-documented chain of custody prevents errors, misidentification, and the potential for legal challenges regarding the accuracy or authenticity of test results. Chain of Custody Documentation When a specimen is collected, the chain of custody form must be filled out thoroughly. The following information must be documented to ensure proper tracking and accountability: 1. Patient Information: The name and identifying information (such as the patient ID number) of the patient or individual from whom the specimen was obtained. 2. Specimen Information: The type of specimen (e.g., blood, urine, swabs, etc.), as well as the body part or object from which the specimen was obtained. 3. Collector’s Information: The name of the person who obtained and processedthe specimen. 4. Date and Location: The date and location where the specimen was collected. 5. Attestation Information: The signature of the person who is attesting that the specimen is the correct one and that it matches its documentation. 6. Signature and Date from Every Custodian: Every person who has handled the specimen (even if just for transporting) must sign and date the form. This includes every individual who has taken possession of the specimen, no matter how brief the interaction was. Transporting and Handling Specimens in Chain of Custody When transferring specimens during the chain of custody process, it is crucial that the specimen remains properly identified and protected. Steps for Transferring Specimens: * Label the Specimen: Ensure that the specimen is labeled properly with identifying information, including the patient’s name, specimen type, and any other relevant details. * Biohazard Bag: Place the specimen in a biohazard bag with a permanent sealto prevent tampering. The seal ensures that the specimen remains intact and protected during transportation. * Specimens as Legal Evidence: Specimens handled under the chain of custody are often legal evidence and must not be tampered with. Tampering with specimens can result in legal consequences and invalidate the use of the specimen in testing. Situations Requiring Chain of Custody Certain tests require strict adherence to the chain of custody because they are used as legal evidence or in sensitive situations. These situations include: Forensic Analysis: Forensic testing may involve various specimens, such as: * Vaginal swabs (after a rape or assault) * Blood and body fluids collected from crime scenes or postmortem (after death) specimens taken during autopsies. * Toxicology testing to identify substances in cases of poisoning, overdose, or drug abuse. Forensic analysis tests are used in criminal investigations, and the specimens must be handled carefully to ensure their integrity is maintained for legal proceedings. Workplace Drug Testing: Chain of custody is vital in workplace drug testing to ensure the accuracy and integrityof results. The specimens collected for drug testing are considered legal evidence in some cases, so maintaining the chain of custody helps protect against challenges to test results. Drug Testing for Professional Athletes: In professional sports, athletes may be tested for performance-enhancing drugs (PEDs). Chain of custody procedures help ensure that the specimen collected from the athlete is handled correctly and that the results are legitimate. Neonatal Drug Testing: Testing for drug use in newborns is essential in situations where the mother may have used substances during pregnancy. Neonatal drug testing must adhere to chain of custody procedures to ensure the results are valid and reliable. Specimens for neonatal drug testing are typically collected within 24 hours of birth to detect drugs used 24 to 72 hours prior to childbirth. Urine Drug Testing Urine drug tests are commonly used to detect the presence of illegal or prescription drugs in the body. These tests may be used in various scenarios, such as workplace testing, legal cases, or medical evaluations. Privacy and Accuracy: * Privacy: It is important to ensure the privacy of the patient during urine collection, as this is a sensitive process. * Accuracy: The specimen must be handled carefully to ensure that the test results are accurate and not compromised. The chain of custody form must be signed and dated by everyone involved in the specimen collection, handling, and transport. * Detection of Drugs: Urine tests can usually detect the use of certain drugs, including: * Marijuana: Can be detected for up to a week after use. * Cocaine, heroin, and other substances: Can typically be detected for 2 days following use. Sports-Related Drug Testing Sports-related drug testing is another area where the chain of custody is critical. These tests typically detect the use of substances that can enhance athletic performance, such as stimulants. Chain of custody is essential to ensure that the sample is not tampered with or contaminated. Neonatal Drug Testing and Procedures As mentioned earlier, neonatal drug testing focuses on the presence of substances used by the mother during pregnancy. Drugs that may be detected include: * Cocaine * Opiates * Amphetamines * Methamphetamines * Phencyclidine (PCP) Collection Timing: * Neonatal drug testing should be performed within 24 hours of birth and typically looks for maternal drug use 24 to 72 hours prior to childbirth

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