respiratory flash cards

COPD

Chronic Obstructive Pulmonary Disease

• Clinical Presentation & Patient Profile for COPD

• Chronic shortness of breath and chronically diminished exercise tolerance.

• Dependence on home oxygen ($\text{O}_2$) therapy, frequently dragging mobile oxygen concentrators; homes typically feature oxygen cannulas laid throughout the living space.

• Multiple prescribed inhalers with varied color-coding and physical shapes (e.g., red, blue, pink) to distinguish daily maintenance steroids from short-acting rescue bronchodilators.

• Frequent use of systemic oral steroids such as Prednisone to treat airway inflammation.

• Personality changes: Chronic acidity, chronic exhaustion, and chronic hypoxia frequently cause patients to display severe irritability or grumpiness.

Pulmonary Edema

• Defined specifically as fluid accumulation inside the alveoli

What causes PULMONARY EDEMA

• When capillary blood pressure in the pulmonary circulation rises beyond normal operational limits, plasma is forced through capillary walls directly into the surrounding alveolar air spaces (analogous to squeezing fluid out of a saturated wet sponge).

Clinical Presentation for Pulmonary Edema

• Rapid, sudden onset of severe shortness of breath.

• Auscultation (lung sounds) reveals wet lung sounds described as crackles or rales.

• Coughing produces characteristic pink frothy sputum.

• Unlike COPD, pulmonary edema is an acute crisis. Patients cannot survive long with fluid-filled alveoli, as fluid eliminates the functional surface area required for systemic gas exchange (which normally equals half a tennis court when alveoli are flattened).

95% of pulmonary Edemas are caused by what?

Left side heart failure

The remaining 5% of causes of pulmonary edemas are from?

1. High altitude exposure

2. Kidney failure

3. Severe burn injuries

4. Toxic inhalation injuries.

Treatment for pulmonary edema is?

• Supplemental oxygen ($\text{O}_2$) delivered via CPAP is the primary prehospital intervention, making pulmonary edema the classic target indication for CPAP therapy.

Pulmonary Embolism (PE) is?

• Defined as a blood clot lodged within a pulmonary artery or one of its vascular branches.

• A PE is fundamentally a circulatory problem (a mechanical vascular blockage) that manifests clinically as a severe respiratory emergency.

Presentation of PE ?

• Small to Medium Pulmonary Embolism:

  • Sudden onset of sharp, pinpoint chest pain.

  • Concurrent acute feeling of shortness of breath.

  • Auscultation yields clear, normal bilateral lung sounds (because ventilatory mechanics are unobstructed).

  • Oxygen saturation ($\text{SpO}_2$) levels may drop rapidly.

  • Massive/Large Pulmonary Embolism:

    • Causes total pulmonary vascular occlusion, immediate cardiovascular collapse, and sudden death (DRT / Dead Right There).

Causes of PE?

• Platelet disorders or underlying genetic hypercoagulability/clotting disorders.

• Systemic blood infections.

• Post-surgical recovery states (mobilization of deep venous thrombi following surgical procedures).

• Major bone fractures (due to deep vascular trauma and venous stasis).

• Chronically poor systemic circulation.

• Sudden sedentary behavior ("Coach Class Syndrome"): Prolonged immobility in cramped seating (e.g., a $16\text{-hour}$ commercial flight in coach

• Pregnancy and the postpartum period: Physiological changes in maternal clotting factors and platelet activity designed to prevent hemorrhage during delivery elevate PE risk up to $3\text{ weeks}$ postpartum.

treatment for PE

• Hospital Treatment:

  • Small to medium PEs are treated in hospital settings using thrombolytics (clot-dissolving medications) or interventional mechanical thrombectomy. Massive PEs causing sudden cardiac arrest carry an extremely poor resuscitation prognosis.

What is Pneumonia?

• Defined as an infectious process located within the lung parenchyma. Ex:(Lung tissue that is involved in gas exchange, like the Alveoli)

Presentation of Pneumonia?

• Presents with a slow, insidious onset of shortness of breath.

• Accompanied by a productive cough yielding thick green, yellow, or brown chunky sputum ("lung butter").

• Systemic clinical signs include fever and generalized physical weakness.

• Auscultation reveals dry or chunky abnormal breath sounds such as rhonchi

shortness of breath

genreal weekness

coughing

sputum is yellow-greenish-chunky

lung sounds (lung butter)

fever

What is the primary function of the respiratory system?

• The primary function of the respiratory system, expressed in the most fundamental terms, is external respiration.

• External respiration consists of exchanging gases between the body's tissues and the outside environment—specifically dumping off carbon dioxide ($CO_2$) and picking up oxygen ($O_2$).

• Through external respiration, the respiratory system maintains homeostatic oxygen ($O_2$) levels and controls the body's $pH$ balance.

= External Gas exchange

What Stimulus activates us to breathe?

• = Central chemoreceptors. (ask me to explain)

• Accumulation of $CO_2$ in the blood creates carbonic acid, lowering blood and CSF $pH$ (increasing acidity). The central chemoreceptor detects this decrease in $pH$ and triggers the involuntary command to breathe.

What Neurotically tells us to breathe?

• Central Chemoreceptors: Buried within this brain structure, central chemoreceptors continuously monitor the $pH$ of the cerebrospinal fluid (CSF).

What are the mechanics of Respiration?

• When the central chemoreceptors trigger a breath, the brain sends simultaneous motor signals to the primary muscles of respiration:

  • Diaphragm: The main structural muscle sheet beneath the lungs.

  • Intercostal Muscles: Multiple muscle pairs located in the spaces between each rib.

• Inspiration (Active Process):

  • The diaphragm and intercostal muscles contract at the exact same time.

  • Contraction expands the chest cavity outward and downward.

  • This expansion increases the volume of the thoracic cavity, generating negative pressure inside the chest relative to atmospheric pressure.

  • Air flows naturally down the pressure gradient from the outside environment into the lungs.

Where does the external respiration gas exchange take place?

• Site of Gas Exchange:

  • Gas exchange takes place exclusively within the alveoli.

  • No gas exchange occurs anywhere along the conducting airways of the bronchial tree.

What is Tidal Volume?

• Defined as the specific volume of air moved into and out of the lungs during a single normal breath.

What is the average tidal volume for an adult?

500mL

What is Asthma?

• Asthma is classified as a reactive airway disease.

• It is characterized by normal, healthy lung tissue that spasms (bronchospasm) in response to a specific trigger.

• It is fundamentally a function of the immune system misreacting, but it is not an allergic reaction.

What are some ex of Asthma Triggers?

• Can be external environmental particles that mimic allergens: dust, pollen, etc.

• Can be non-allergic systemic triggers: emotional stress, physical exercise (exercise-induced asthma), specific foods, or strong smells/chemical odors.

Signs and Symptoms of asthma

• Rapid, sudden onset of shortness of breath (dyspnea).

• Bronchospasm.

• Wheezing on auscultation.

Treatment for asthma?

• Administration of high-flow oxygen ($O_2$).

• Assisting the patient with their prescribed Metered-Dose Inhaler (MDI).

• Administration or placement of an epinephrine auto-injector (EpiPen) in severe, refractory cases.

( Lung sounds) What is wheezing?

• Physiological Cause: Indicates lower airway bronchospasm.

• Acoustic Profile: High-pitched, musical sound; often described as a misplaced musical note (like a clarinet) or a dog toy squeaker inside the chest.

• Progression: Begins primarily as expiratory wheezing; as airway narrowing worsens, progresses to both inspiratory and expiratory whistling.

• Context: Primary abnormal sound heard during an asthma attack or bronchospastic medical events.

(Lung sounds) What are Rales/ Crackles?

• Physiological Cause: Wet lung sounds caused by fluid accumulation in the lower airways and alveoli.

• Classification Levels:

  • Fine Rales: Soft, scratchy, subtle sound. Described acoustics include rolling a few strands of hair between fingers right next to the ear, or the light popping sound of Rice Krispies in milk. Associated with mild shortness of breath. Difficult to detect without extensive clinical practice and high-end equipment.

  • Coarse Rales: Distinct, loud, bubbling sound. Acoustically identical to an 8-year-old child blowing bubbles through a straw into a glass of milk. Associated with significant, severe respiratory distress. Primary indication for Continuous Positive Airway Pressure (CPAP) therapy.

  • Audible Rales ("Death Rattle"):

(Lung sounds) What are Rhonchi?

• Physiological Cause: Secretion accumulation, thick mucous plugs, or severe congestion in the larger airways (often colloquially termed "lung butter" or "junky lung sounds").

• Acoustic Profile: Low-pitched, heavy, rough, rattling sound (analogous to the thick mucous character depicted in Mucinex green goblin media).

• Associated Pathologies: Pneumonia, chronic bronchitis, lung cancer.

• Pathophysiological Note on Pneumonia: Pneumonia is fundamentally a drying disease process that produces thick mucus; maintaining aggressive patient hydration is required so secretions remain fluid enough for the patient to expectorate (cough up).

(Lung Sounds) Strider?

• Physiological Cause: Upper airway obstruction or upper airway swelling (not a true lower lung tissue sound).

• Mechanisms: Foreign Body Airway Obstruction (FBAO, such as a child with a Lego toy head or coin lodged in the upper airway) or severe upper airway infection (e.g., croup, epiglottitis).

• Acoustic Profile: High-pitched, harsh, audible squeaking or barking sound produced during inhalation.

Whats the difference between Diminished and unequal lung sounds?

• Diminished Lung Sounds: Refers to globally reduced air movement bilaterally (e.g., an extreme asthma attack where bronchoconstriction is so profound that insufficient air moves to even generate a wheeze).

• Unequal Lung Sounds: Refers to asymmetry between sides, where breath sounds are normal on one side but absent or significantly decreased on the opposite side (e.g., a traumatic pneumothorax secondary to a fractured rib).

Define COPD?

• non-reversible lung disorders characterized by the permanent structural destruction of lung tissue (unlike asthma).

• Primarily includes Emphysema and Chronic Bronchitis (as well as conditions involving tissue loss such as mesothelioma).

List Three Primary Pathophysiological Mechanisms of COPD:

1. Loss of Tissue Elasticity: The parenchyma loses its natural elastic recoil, preventing passive chest deflation.

2. Diminished Gas Exchange Capacity: Destruction of alveolar membranes significantly reduces surface area for $O_2$ absorption and $CO_2$ clearance.

3. Cilia Dysfunction and Paralysis: Microscopic, hair-like fibers (cilia) lining the bronchial tree become paralyzed or destroyed. Because cilia can no longer sweep debris and mucus out of the lungs, the patient must chronically cough to clear airways.

In COPD cases when the central chemoreceptors fail what is the backup system that tells the system to breathe?

• the body shifts control to peripheral chemoreceptors that monitor arterial oxygen levels ($O_2$).

EX: The patient no longer receives a signal to breathe from elevated $CO_2$ or low $pH$; instead, they only breathe when systemic arterial oxygen drops to dangerously low levels (hypoxia).

• The patient adapts to living in a chronically acidic baseline state.

• Exercise Intolerance: Because breathing is only triggered after hypoxia sets in, COPD patients exist in a state of baseline fatigue with extremely limited physical exercise tolerance

What is a Pneumothorax

• A pneumothorax is defined as the presence of air within the pleural space.

• Colloquially known in lay terms as a collapsed lung.

what are the signs of Pneumothorax

• Dyspnea (difficulty breathing / shortness of breath).

• Unequal or asymmetric breath sounds upon auscultation.

• Rapid / sudden onset of clinical symptoms.

What are some Classifications of Pneumothorax

• Traumatic Pneumothorax:

  • Open Traumatic Pneumothorax: Caused by penetrating thoracic trauma that breaks the integrity of the external chest wall (e.g., gunshot wound from a $0.45$-caliber bullet, stab wound from a knife or samurai sword). Atmospheric air enters directly into the pleural space through the chest wall deficit.

  • Closed Traumatic Pneumothorax: Caused by blunt thoracic trauma (e.g., impact to the chest from a baseball bat swinging at $90\,\text{mph}$). Fractured ribs flex inward, acting as sharp bone fragments that lacerate underlying lung parenchyma. When the chest wall recoils to its normal anatomical appearance, internal air continues to leak from the damaged lung tissue into the pleural space.

• Medical Pneumothorax:

  • Occurs secondary to underlying chronic respiratory pathology or tissue destruction, such as Chronic Obstructive Pulmonary Disease (COPD) or pulmonary neoplasm (lung cancer).

  • Loss of ciliary function and chronic tissue degradation weaken the lung parenchyma.

  • Severe coughing fits can rupture compromised pulmonary tissue, causing air leakage into the pleural space without external physical trauma.

• Spontaneous Pneumothorax:

  • A non-traumatic, non-pathological tissue rupture resulting from a congenital or genetic predisposition.

  • Pathophysiology involves rapid vertical growth spurts during development, leading to hyper-stretched lung tissue and formation of subpleural blebs prone to spontaneous rupture.

  • Demographic Profile: Predominantly affects young, tall, thin/skinny, white, athletic males (e.g., individuals measuring $6\,\text{ft}\,6\,\text{in}$ in height).

what is a Hemothorax

• A hemothorax is defined as an accumulation of blood within the pleural space.

• Etiology is almost exclusively tied to traumatic injury (penetrating or severe blunt force chest trauma).

Clinical Presentation of Hemothorax?

• Sudden onset of severe shortness of breath.

• Unequal or diminished breath sounds on the affected side.

• In a closed, prehospital chest trauma presentation, physical examination alone cannot reliably distinguish between a closed pneumothorax and a closed hemothorax.

• Traumatic chest injuries frequently result in a combination of both blood and air in the pleural space (hemopneumothorax).

Prehospital Emergency Management for Hemothorax?

• Rapid transport is the paramount clinical priority for thoracic trauma.

• Management of shock:

  • Positioning the patient appropriately (supine/shock position as tolerated).

  • Administration of high-flow oxygen therapy.

  • Maintaining patient body temperature (thermoregulation/preventing hypothermia).

what is Pleural Effusion?

• A pleural effusion is defined as an accumulation of fluid—specifically blood plasma—within the pleural space.

• Primary etiology includes malignant pulmonary neoplasms (lung cancer), where aggressive thoracic tumors exude plasma fluid into the surrounding pleural cavity.

Clinical Presentation and Onset of pleural Effusion?

• Onset: Very slow and progressive development over weeks (e.g., a $3\,\text{week}$ insidious onset), contrasting sharply with the immediate onset of traumatic or spontaneous pneumothorax.

WHat is Anaphylaxis

• An allergic reaction is an exaggerated, hypersensitive immune system response to an external invader or allergen (e.g., peanuts, shellfish).

• While a normal immune system neutralizes foreign antigens undetected, a hypersensitive immune system undergoes massive overactivation upon exposure.

WHat are som ex of reactions from an allergic reaction and Anaphylaxis?

• Skin (Integumentary System):

  • Urticaria (hives/welts).

  • Pruritus (intense itching).

  • Periorbital edema (swelling around the eyes) and facial/oral angioedema (swelling around the lips, mouth, and tongue).

• Respiratory System:

  • Bronchoconstriction (severe smooth muscle contraction narrowing the lower airway bronchioles, identical in mechanism to an acute asthma attack).

  • Auscultation reveals high-pitched wheezing.

  • Severe respiratory distress / dyspnea.

• Cardiovascular System:

  • Severe, widespread systemic vasodilation.

What is The Container Concept

• The Vascular Container:

  • The "container" encompasses the entire circulatory system capacity, including all arteries, arterioles, capillaries, venules, veins, the heart, and vascular organs.

  • In a normal adult human ($\text{Homo sapiens}$), the total vascular container capacity is approximately $6\,\text{L}$ ($6\,\text{liters}$).

  • The adult human circulating blood volume is approximately $6\,\text{L}$.

  • A full container ($6\,\text{L}$ of fluid in a $6\,\text{L}$ capacity vessel network) generates normal systemic vascular resistance (SVR) and maintains normotensive blood pressure.