Renal System and kindey

Urinary Conditions

• Urinary Tract Infections (UTI)

• Incontinence

• Retention

• Benign Prostatic Hyperplasia (BPH)

Urinary Tract Infection Classifications

• Uncomplicated: No functional or anatomical abnormalities exist; no associated disease and risk for complication is low.

• Acute Cystitis: Affects only lower urinary tract structures. Clinical manifestations include:

  • Urgency

  • Dysuria

  • Suprapubic pain

• Acute Pyelonephritis: Affects upper urinary tract structures. Clinical manifestations include:

  • Flank pain

  • Fever greater than 38°C

• Asymptomatic Bacteriuria: Positive urine culture but without clinical manifestations.

• Health care-associated UTI (HAUTI): UTI a client develops while being treated for another condition in the health care system. Frequently associated with indwelling urinary catheters for more than 2 days, often called Catheter Associated UTI (CAUTI).

Urinary Tract Infection Pathophysiology

• Cause: Usually caused by Enteric coliform (E. Coli) bacteria traveling up the urethra to the bladder, more frequent in females due to shorter urethra.

• Etiology and Risk Factors:

  • Being female (meatus closer to rectum)

  • Presence of indwelling urinary catheters

  • Poor hygiene

  • Sexual intercourse

  • Frequent pelvic exams

  • Use of diaphragms/condoms with spermicidal foam

• Comorbidities:

  • Clients with diabetes (type I or II) or those who are immunocompromised.

• Epidemiology:

  • Highest rates in females aged 16-35.

Impact of Urinary Tract Infection on Health

• Psychosocial: Clients may feel embarrassed or anxious if a bathroom is not near.

• Age-related considerations:

  • Adults over 55 years may have limited ability to perform activities of daily living, such as wiping from front to back.

  • Infection is more common among post-menopausal females.

  • Key Concept: UTI in elderly clients may present as new onset confusion, new onset urinary incontinence, lack of appetite, lethargy, and low grade or no fever. Increased risk of developing urosepsis in elderly clients.

Clinical Presentation of Urinary Tract Infection

• Clinical Manifestations:

  • Increased urgency and frequency of urination

  • Dysuria

  • Hematuria

  • Suprapubic pain

• Kidney involvement: Flank or back pain, nausea and vomiting, chills, high fever.

• Bladder involvement: Bloody urine, lower abdominal pain with or without pelvic pressure, frequency, and dysuria.

• Urethra involvement: Discharge from the urethra and burning with urination.

• Lab and Diagnostic Testing:

  • Urine dipstick test for presence of hematuria, leukocytes, and nitrites.

  • Urine culture for specific causative agents.

Education on Urinary Tract Infection

• Importance of completing the entire antibiotic regimen, even if symptoms improve, as bacteria may still be present.

• Hydration: Instructed to drink 2 to 3 liters of water or other fluids per day.

• Recommendations for females:

  • Wipe from front to back after urination.

  • Urinate after sexual activity.

  • Prefer showers over baths.

  • Empty the bladder often.

Treatment and Therapies for Urinary Tract Infection

• Pharmacology:

• First-line treatment: Trimethoprim/sulfamethoxazole (classification: sulfonamides).

• Other antibiotics include:

  • Nitrofurantoin

  • Fluoroquinolones

• Non-opioid analgesic: Phenazopyridine treats discomfort, burning, and dysuria.

Incontinence

• Pathophysiology: Weakness of urethral sphincter or pelvic floor muscles resulting in involuntary urinary leakage.

• Etiology:

  • Risk factors: Food and drink (alcohol, chili peppers, caffeine), medications (diuretics like furosemide, antihypertensive medications like alpha blockers such as doxazosin).

• Comorbidities: COPD/asthma, neurological conditions.

• Epidemiology:

  • Stress incontinence is the most common type in females (up to 45% over age 30).

  • Urge incontinence most common in males (~42% over age 75).

Impact of Incontinence on Health

• Psychosocial: Stigma, feelings of embarrassment, and humiliation.

• Age-related considerations: Increased risk for falls/injury affecting many persons over 60 due to physiological changes including:

  • Decreased strength of detrusor muscle

  • Decreased bladder capacity

  • Increased residual urine volume

  • Diminished pelvic floor muscle tone and resistance

  • Hormonal changes post-menopause.

Clinical Presentation of Incontinence

• Involuntary loss of urine or sudden desire to void with urine leakage.

• Lab Testing/Diagnostic Testing:

  • Stress test: Ask the client to cough when standing with a full bladder.

  • Urinalysis: Rule out infection.

  • Bladder scan: Measure post-void residual.

Nursing Role in Incontinence Management

• Develop client care based on the primary need of the client, considering:

  • Environmental factors: Lack of toileting facilities and limited opportunities to void.

  • Safety considerations: Increased risk for falls correlated with incontinence.

  • Individual factors: Impact on lifestyle and self-esteem, e.g., use of incontinent pads/briefs or dealing with bedwetting.

Treatment and Therapy for Incontinence

• Pharmacology:

  • Urinary Antispasmodics: Ditropan (oxybutynin).

  • Bladder Relaxants: Mirabegron (Myrbetriq).

• Bladder Training:

• Pelvic Floor Muscle Training:

  • Kegel exercises for stress incontinence.

• Catheters: Utilization and types including discharged designs.

Urinary Condition: Retention

• Pathophysiology: Inability to void or empty bladder can be acute or chronic.

• Obstructive Causes: Pelvic organ prolapse, Benign Prostatic Hypertrophy (BPH), renal stones.

• Infectious Causes: Prostatitis, urethritis, UTI.

• Other Causes: Complications from childbirth, neurological disorders.

• Etiology and Comorbidities: Include neurological disorders or injury; affects more males than females.

• Epidemiology: Reasons for increased incidence among specified demographics.

Clinical Presentation of Retention

• Symptoms: Painful urination, urgency complaints, bladder fullness after voiding, hematuria, foul-smelling urine.

• Acute: Lower abdominal pain/discomfort.

• Chronic: May be asymptomatic or present with slow urine stream or reduced urge to void.

• Lab Testing/Diagnostic Studies:

  • Urine culture may need catheterization.

  • Bladder Scan: Ultrasound for post-void residual measurement.

  • Cystoscopy.

Nursing Role for Retention

• Safety Considerations:

  • Awareness of impacts on urinary function after back trauma or surgery.

• Client Education:

  • Understanding of indwelling or intermittent catheter placement.

Treatment and Therapies for Retention

• Key Concept: Treatment based on the cause of retention.

• Medications: For urinary retention related to enlarged prostate, utilizing 5-alpha reductase inhibitors to reduce prostate growth or alpha-blockers to relax bladder muscles.

Benign Prostatic Hyperplasia (BPH)

• Pathophysiology: BPH is a non-cancerous growth of prostate tissue that compresses the urethra, potentially causing retention or blockage of urine flow.

• Etiology:

  • Linked to sensitivity of the aging prostate to androgens (e.g., testosterone) leading to cell proliferation in the prostate.

• Risk Factors: Male over 50 years, history of first-degree relative with BPH, obesity, metabolic syndrome.

• Comorbidities: Metabolic syndrome and obesity.

• Epidemiology: Affects roughly 50% of males over 50 years old and up to 80% of males over 80 years old.

Psychosocial and Physiological Impact of BPH

• Increased frequency and urgency may reduce quality of life, self-esteem, and increase social anxiety and emotional distress.

• Age-Related: Increased age correlates with higher risk of BPH; prostate volume increases by approximately 2–2.5% annually.

Clinical Presentation of BPH

• Lower urinary tract manifestations,

  • Difficulty initiating urine stream

  • Dysuria

  • Nocturia

  • Increased urination frequency and urgency

  • Urine retention due to inability to empty bladder thoroughly

  • Weak urine stream

  • Excessive growth of prostatic tissue leading to urethral compression and bladder outflow obstruction.

• Lab and Diagnostic Testing:

  • Digital rectal exam for prostate size.

  • Prostate-specific antigen (PSA) test for prostate cancer screening.

Treatment and Therapies for BPH

• Lifestyle Modification:

  • Dietary changes (decrease saturated fats), exercise, reducing caffeine intake, smoking cessation.

• Pharmacology:

  • Alpha-blockers to relax smooth muscles in the prostate and bladder neck for easier urination.

  • 5-alpha reductase inhibitors to inhibit hormones that increase prostate enlargement.

• Surgical Management:

  • Prostatectomy

  • Transurethral Needle Ablation (TUNA)

  • Transurethral Incision (TUIP)

  • Photoselective vaporization of prostate (PVP)

  • Transurethral Resection of Prostate (TURP): Most common surgical treatment; removes prostatic tissue using a resectoscope guided through the penis.

Conditions of Kidney Function

• Key Conditions:

  • Pyelonephritis

  • Polycystic Kidney Disease (PKD)

  • Glomerulonephritis

  • Renal Calculi

  • Acute Renal Failure (ARF)

  • Chronic Kidney Failure (CKF)

Pyelonephritis Pathophysiology

• Acute Pyelonephritis: Severe infection of kidneys leading to swelling, possible urinary obstructions, can rarely become chronic.

• Kidneys maintain fluid and electrolyte balance; damage results in impaired regulation.

Pyelonephritis Etiology

• Usual Cause: Gram-negative bacteria (e.g., E. colli) in fecal matter spreading to the kidneys.

• Risk Factors: Conditions interrupting normal urine flow (renal stones, enlarged prostate, use of urinary catheter).

• Comorbidities: Diabetes.

• Epidemiology: Approximately 15-17 cases/10,000 females and 3–4 cases/10,000 males annually; most commonly affected group: young sexually active females with increased risk during pregnancy's second and third trimesters.

Impact of Pyelonephritis on Health

• Age-Related: Older clients may present as asymptomatic or with new onset confusion.

• Clinical Presentation:

  • Fever > 102°F

  • Side, back, or groin pain

  • Dysuria

  • Cloudy or bloody urine with a fish-like odor

  • Mental confusion, nausea, vomiting, fatigue, chills.

  • With kidney damage, manifestations of fluid overload like weight gain and edema; if chronic, may present with no clinical manifestations.

• Lab and Diagnostic Testing:

  • Urinalysis

  • Renal ultrasound

  • Radioactive imaging (DMSA test)

  • Kidney function tests (BUN, creatinine).

Nursing Role in Pyelonephritis

• Prevention and Education:

  • Maintain adequate hydration to flush bacteria from the urinary system.

  • For females, educate on adequate hygiene practices to avoid urethral contamination.

• Treatment and Therapies:

  • Antibiotics (levofloxacin, ciprofloxacin, cotrimoxazole, ampicillin).

  • Hydration (IV fluids if hospitalized).

Polycystic Kidney Disease (PKD)

• Pathophysiology: Inherited disorder causing fluid-filled cysts in kidneys, leading to damage and impaired function. Types:

  • Autosomal dominant (ADPKD)

  • Autosomal recessive (ARPKD).

• Etiology: Fourth leading cause of renal failure; most diagnosed between ages 30-50. ADPKA1 (infantile PKD) diagnosed in infants.

• Risk Factors: Genetic disorder, family history, non-curable or preventable.

• Comorbidities: Likely to have cysts in the liver, pancreas; may experience cardiac disease, cerebral aneurysms, and colonic diverticula.

• Impact on Health: Increased risk for clinical depression and anxiety; 50% progression to end-stage renal disease by age 60.

Clinical Presentation of PKD

• Symptoms may include:

  • Flank pain

  • Polyuria

  • Nocturia

  • Hematuria

  • Palpable kidney masses

  • Hypertension

  • Proteinuria.

• As PKD progresses to renal failure, fluid and electrolytes will be altered, leading to signs of fluid overload (shortness of breath, weight gain, edema).

• Lab and Diagnostic Testing:

  • CT or renal ultrasound to determine number, location, and size of cysts compared to healthy kidneys.

Nursing Role in PKD

• Primary Focus: Support, advocacy, and education for the client and family.

• Genetic Testing: Recommended for the client’s children.

• Client education encompasses medications, diet, smoking cessation, and access to support groups.

Treatment and Therapies for PKD

• Management focuses on clinical manifestations and slowing the decline of renal function.

• Pharmacology: Tolvaptan may be used to reduce cyst size and kidney growth, and alleviate pain.

Glomerulonephritis Pathophysiology

• A group of renal diseases characterized by immune-mediated damage to glomeruli resulting in decreased Glomerular Filtration Rate (GFR).

• Chronic Glomerulonephritis: A slow progression leading to impaired renal function and kidney failure.

• Key Concept: Inflammation of the glomeruli affects filtering ability, causing waste accumulation in the bloodstream and regulation disruption of essential minerals, nutrients, red blood cells, and proteins.

Glomerulonephritis Etiology and Epidemiology

• Key Concept: Linked to poorly controlled hypertension, diabetic nephropathy.

• Risk Factors: Recent infections (e.g., bacterial endocarditis, Hepatitis B/C, HIV), many others unknown.

• Comorbidities: Conditions like lupus, Diabetes types 1 and 2, Goodpasture's syndrome, Berger's disease.

• Epidemiology: Causes 10-15% of end-stage renal disease (ESRD) cases in the U.S. with the top three causes being diabetes mellitus, hypertension, and chronic glomerulonephritis, capable of progressing to ESRD within weeks or months.

Impact on HealthSecondary to Glomerulonephritis

• Disease is progressive with age-related consequences.

• By age 80, individuals experience approx. 30% scarring of glomeruli leading to progressively declining kidney function.

Clinical Presentation of Glomerulonephritis

• Symptoms may include:

  • Periorbital edema

  • Dark, frothy urine

  • Elevated blood pressure

  • Weakness

  • Fever

  • Malaise

  • Abdominal discomfort.

• Clinical manifestations often reported up to three weeks post-infection; presents with bilateral inflammation of glomeruli 7-10 days post-streptococcal infection.

• Key Concept: Severity based on clinical manifestation from proteinuria > 3.5 g/day and edema.

Lab and Diagnostic Testing for Glomerulonephritis

• Focuses on identifying the cause:

  • Lab: CBC, serum electrolytes, renal function tests (BUN, creatinine, GFR, urinalysis). Determine kidney damage and proteinuria levels through 24-hour urine collection.

  • Diagnostic: Kidney biopsy, renal ultrasound.

Nursing Role in Glomerulonephritis Management

• Education on:

  • Lifestyle modification (diet, smoking cessation)

  • Diabetes management

  • Hypertension management

  • Hyperlipidemia management.

• Individual factors: Importance of annual flu and pneumococcal vaccines, especially for clients with chronic kidney disease.

Treatment and Therapies for Glomerulonephritis

• Primary Focus: Management of underlying causes.

• Therapies: Plasma exchange to slow damage until chemotherapy is effective.

• Pharmacology:

  • Corticosteroids (e.g., prednisolone) reduce inflammation and suppress the immune system.

  • Rituximab (Rituxan) used for lupus nephritis or nephrotic syndrome.

  • Cyclophosphamide (Procytox) as an immunosuppressant interrupting the cell cycle during protein synthesis, used alongside corticosteroids.

Renal Calculi Pathophysiology

• Also known as kidney stones, nephrolithiasis, or urolithiasis; forms from accumulations of minerals and salts, potentially lodging in the kidney or urinary tract causing pain and hematuria.

• Formation Risk: Urine pH > 7.2 increases likelihood of calcium oxalate stone formation; more alkaline urine can lead to calcium phosphate stones. 80-90% of renal calculi pass through the urethra spontaneously.

Etiology of Renal Calculi

• Key Risk Factors: Dietary, genetic, environmental, and lifestyle factors, inadequate hydration, hyperparathyroidism contributing to calcium-based stones.

• Comorbidities: Hypertension, CKD, Type 2 diabetes.

Clinical Presentation of Renal Calculi

• Symptoms include acute onset of severe flank pain, nausea, vomiting, and potentially systemic infection, notably pyelonephritis, which may necessitate obstruction removal.

• Key Concept: Obstructions due to renal calculi may severely obstruct urine flow, making resolution a priority for pain relief.

Lab and Diagnostic Testing for Renal Calculi

• Testing includes:

  • KUB (kidney, ureter, bladder) imaging.

  • Ultrasound of the kidneys for obstruction or hydronephrosis.

  • Non-contrast abdominal and pelvic CT scan (most reliable); avoid IV contrast due to nephrotoxicity risks.

Nursing Role for Renal Calculi Management

• Individual Factors: Prevention based on client compliance with long-term medication and dietary modifications.

• Client Education: Emphasize importance of straining urine to catch stones, modifying diet to avoid high-calcium foods, restricting protein and salt intake, and increasing water intake.

Treatment and Therapies for Renal Calculi

• Pharmacology: Tamsulosin (Flomax), nifedipine (Procardia), or alfuzosin (Uroxatral) are utilized as expulsion therapy to relax ureteral muscles, enhancing the likelihood of stone passage.

• Procedures:

  • Extracorporeal shockwave lithotripsy (ESWL) for stones in the kidney and upper ureter.

  • Ureteroscopy with laser lithotripsy for stones in the lower ureter.

Acute Renal Failure/Acute Kidney Injury (ARF/AKI)

• Sudden onset and typically reversible decrease in kidney function with significant implications for disease management (many drugs and diagnostics are renal-excreted). Dosages may need adjustment based on renal function changes.

Pathophysiology of ARF/AKI

• Pre-renal Causes: Approximately 60% of ARF is due to decreased renal blood flow; causes include hypotension, hypovolemia, heart or liver failure.

• Medications: Certain drugs (NSAIDs, ARBs, ACEI, cyclosporine) may induce pre-renal ARF/AKI.

Inter-renal Causes of ARF/AKI

• Occurs when damage has afflicted the kidney’s functional structures (renal cortex and medulla); responsible for about 35% of ARF cases.

• Acute Tubular Necrosis (most common inter-renal cause): preceded by sepsis, ischemic, or nephrotoxic events; results in renal cell death and decreased GFR.

Post-Renal Causes of ARF/AKI

• Involves urinary system obstruction post-kidney limiting urination; accounts for about 5% of ARF cases due to various obstructions like enlarged prostate or calculi.

ARF/AKI Lab and Diagnostic Testing

• Serum Creatinine: Levels rise if kidneys fail to excrete this byproduct.

• Blood Urea Nitrogen (BUN): Indicates how well the kidneys process urea nitrogen, rising as function decreases.

• Glomerular Filtration Rate (GFR): Less than 15 mg/mmol necessitates immediate intervention (e.g., dialysis).

Acute Kidney Failure: Impact on Organs

• Confers risk of uremic toxins, acid-base imbalances, electrolyte imbalances, inflammation, oxidative stress, neuro-hormonal dysfunction affecting major organs:

  • Brain: Uremic encephalopathy, long-term dementias, stroke risk.

  • Heart: Congestive heart failure, arrhythmias, ischemic heart diseases.

  • Lung: Acute lung injury, pulmonary edema.

  • Liver: Altered hepatic metabolism/synthesis.

  • Intestine: Altered gut microbiota, toxin accumulation.

  • Immune System: Systemic inflammation risk.

Treatment and Therapies for ARF/AKI

• Treatments depend on cause:

  • Pre-renal: Fluid challenge, eliminate nephrotoxic medications (e.g., vancomycin, tetracycline).

  • Clinical Manifestations:

  • For hyperkalemia: Loop diuretics (e.g., Furosemide) promote excretion of excess water and electrolytes but contraindicated if kidneys are not producing urine.

  • For hypokalemia: Sodium polystyrene sulfonate (Kayexalate) exchanges sodium with potassium in the intestine to lower serum potassium levels but is contraindicated for life-threatening hyperkalemia or bowel obstructions.

Chronic Kidney Disease (CKD)

• Definition: Gradual loss of kidney function over time, leading to chronic kidney failure (CKF), also known as chronic renal failure (CRF). End-stage renal failure (ESRF) synonymous with kidney failure.

Pathophysiology of CKD

• Unlike ARF, recovery isn’t possible in CKD due to permanent damage. Chronic nephropathies initiate gradual fibrosis and damage across kidney compartments (glomeruli, tubules, vessels).

Etiology of CKD

• Major diseases causing CKD leading to ESRD include:

  • Diabetes Mellitus

  • Hypertension

  • Other causes: primary and secondary glomerulonephritis, chronic tubulointerstitial nephritis, hereditary diseases, neoplasms, sickle cell nephropathy.

• Risk Factors:

  • Modifiable: Hypertension management, proteinuria linked to diet, obesity, smoking.

  • Non-modifiable: Race/ethnicity (Asians, Hispanics, and Blacks more at risk), males over 65 years old.

• Clients with three comorbidities in CKD stages 3-5 are more likely to require dialysis sooner.

Stages of Chronic Kidney Failure

CKD Lab and Diagnostic Testing

• Glomerular Filtration Rate (GFR):

  • > 60 mg/mmol is normal; < 60 mg/mmol indicates possible kidney disease; < 15 mg/mmol indicates kidney failure.

• Urine Albumin: 24-hour urine collection; normal is ≤ 30 mg/g; > 30 mg/g signals potential kidney disease.

• Creatinine and Ratio Analysis: Creatinine levels and urine albumin-to-creatinine ratio (UACR) are ordered to assess kidney function.Urinary System Function, Data Collection and Therapeutic Measures

  Anatomy of the Kidney

  The kidneys are complex organs with distinct regions and structures crucial for their functions. The renal cortex forms the outer region, while the renal medulla forms the inner area. Extensions of the renal cortex, known as renal columns, separate the inner region into cone-shaped sections referred to as renal pyramids. Each pyramid's base faces outward towards the cortex, and the apex, known as the renal papilla, points towards the hilum of the kidney. The renal papilla extends into a minor calyx, which collects urine drained from the papilla.

  • Minor Calyces: Two or three of these minor calyces combine to form a major calyx.

  • Renal Pelvis: The major calyces converge into the renal pelvis, which is responsible for receiving urine from the major calyces and channeling it into the ureter, which transports urine to the urinary bladder.

  Nephrons

  Nephrons are the functional units of the kidney, responsible for filtering blood and forming urine. Each nephron is supplied with blood through an afferent arteriole, which branches into a cluster of capillaries called a glomerulus. The glomerulus is encased by Bowman's capsule, which plays a critical role in filtering blood.

  1. Blood enters the glomerulus via an afferent arteriole.

  2. Blood exits through an efferent arteriole that connects to a network of capillaries surrounding the renal tubules, known as the peritubular capillaries. Here, water and solutes are reabsorbed back into the bloodstream.

  3. Blood is eventually transported from these capillaries into larger veins, which feed into the renal vein.

  Kidney Functions

  The kidneys perform numerous vital functions, including but not limited to:

  • Formation of urine

  • Excretion or conservation of water

  • Maintenance of electrolyte balance

  • Regulation of acid-base balance

  • Activation of vitamin D

  • Production of erythropoietin (a hormone that stimulates red blood cell production)

  • Production of renin (an enzyme that regulates blood pressure)

  Glomerular Filtration Rate (GFR)

  The kidneys effectively filter blood, forming what is known as renal filtrate. The glomerular filtration rate (GFR) is a crucial measure of kidney function, averaging 100 to 125 milliliters per minute under normal conditions. This rate indicates how well the kidneys are filtering waste and excess fluid from the blood.

  Characteristics of Normal Urine

  Normal urine presents with distinct characteristics:

  • Volume: 1,000 to 2,000 milliliters within 24 hours.

  • Color: Ranges from pale yellow to amber.

  • Appearance: Clear, indicating healthy urine.

  • Specific Gravity: Ranges from 1.005 to 1.030, with lower values indicating dilution and higher values indicating concentration.

  • pH Levels: Ranges from 4.5 to 8.0.

  • Constituents: Composed of approximately 95% water, with waste products including urea, creatinine, and uric acid.

  Aging and the Renal System

  As individuals age, there are observable effects on the renal and urinary systems, including:

  • Decreased bladder size and a reduction in the tone of the detrusor muscle.

  • A decreased ability to concentrate urine.

  • In females, the pelvic floor muscles weaken, leading to increased urinary incontinence.

  • In males, the risk of urinary issues increases due to prostate enlargement.

  • Increased vulnerability to bladder infections, dysuria (painful urination), urinary frequency, and urine retention.

  • A notable decrease in GFR with age, which can complicate urine production and elimination.

  Data Collection in Urinary System Assessment

  Accurate data collection is essential for identifying kidney disease and its impacts on the body's systems. Key aspects of health history include:

  • Reporting of flank pain or burning sensations during voiding.

  • Observations of new onset edema, shortness of breath, and weight gain.

  • Assessing fluid intake and functional ability.

  Objective Data Collection: Physical Examination

  • Vital Signs: High blood pressure may indicate kidney complications.

  • Lung Sounds: Crackles can suggest fluid overload.

  • Edema: Indicates potential fluid overload, requiring further assessment.

  • Daily Weights: This is the best indicator of fluid balance; accuracy here is critical for medication and fluid orders.

  • Skin Inspection: An examination for yellow or gray casts and uremic frost, which may indicate underlying renal issues.

  Laboratory Tests for Kidney Function

  24-Hour Urine Collection

  • The patient must void and discard the first urine, marking it as the start time for the 24-hour collection.

  • On completion of the 24 hours, they void again, adding this last sample to the collection to ensure all urine is captured. Incomplete collections can lead to inaccurate results.

  Urine Culture

  • This test identifies pathogens in the urine, typically bacteria or yeast. The urine specimen must be obtained before administering anti-infective medications to avoid altering the results.

  • A sensitivity test is also conducted to determine which anti-infective agents can effectively eliminate the identified pathogens.

  Blood Tests

  1. Blood Urea Nitrogen (BUN): A metabolic byproduct from protein breakdown, where elevated levels (normal range: 7-20 mg/dL) can indicate compromised kidney function.

  2. Serum Creatinine (Cr): Normal levels are

  3. Glomerular Filtration Rate (GFR): Evaluated through serum tests; normal is 90 mL/min or greater. This value may variate with age, typically decreasing as one ages.

  Renal Biopsy

  A renal biopsy provides critical insights into kidney diseases:

  • It involves obtaining a small sample of renal cortex for analysis via a flank incision.

  • Contraindications include bleeding tendencies, uncontrolled hypertension, and having a solitary kidney.

  Renal Biopsy Procedure

  • Procedures can be percutaneous or through open incision.

  • Precare: Patients should be NPO (nil per os) and may receive mild sedation.

  • Postcare: Close monitoring includes checking the pressure dressing, regularly assessing vital signs, and observing for any bleeding from the biopsy site or at first voiding following the procedure.

  Radiological Studies

  Several imaging techniques are utilized to assess kidney function and identify abnormalities:

  • Kidneys-Ureter-Bladder (KUB) X-ray: This can reveal tumors, swollen kidneys, or kidney stones.

  • Pyelogram: Imaging of the renal pelvis and calyces; types include:

    • IV Pyelogram: Uses contrast injected intravenously and requires serial X-rays to observe contrast clearance from the blood.

    • Retrograde Pyelogram: Contrast is introduced through the ureter.

    • Antegrade Pyelogram: Contrast is introduced percutaneously into the renal pelvis.

  • Renal Angiography: Visualizes renal arteries post-contrast; monitoring distal pulses and dressings is essential following the test to check for bleeding.

  Contrast-Induced Acute Kidney Injury

  • Certain contrast agents are nephrotoxic and can lead to acute kidney injury, especially in high-risk populations. An increase in serum creatinine levels may occur, although patients often remain asymptomatic. Key risk factors include low GFR indicative of renal impairment, diabetes mellitus combined with low GFR, and exposure to nephrotoxic medications.

  Endoscopic Procedures

  During endoscopic evaluations:

  • Cystoscopy involves inserting a cystoscope into the bladder via the urethra, enabling visualization.

  • A retrograde pyelogram is performed by injecting contrast media into the kidney pelvis, followed by X-ray imaging. Post-procedure urine output should be monitored closely.

  Renal Ultrasound

  This non-invasive procedure uses sound waves to examine urinary tract anatomy, showing kidney enlargement, stones, chronic infections, or tumors. No special preparation is needed prior to the ultrasound.

  Urinary Incontinence Types

  Incontinence refers to involuntary urine loss and presents in several forms:

  1. Stress Incontinence: Triggered by abdominal pressure increase due to activities such as coughing or sneezing.

  2. Urge Incontinence: The patient reports an urgent need to void but finds inability to reach the toilet in time.

  3. Overflow Incontinence: Results in continuous and unpredictable urine loss associated with bladder overdistention.

  4. Total Incontinence: Involves complete loss of urinary control.

  Urinary Retention

  Potential causes of urinary retention can be classified into acute and chronic:

  Acute Causes

  • Anesthesia and local trauma to urinary structures, some medications.

  Chronic Causes

  • Enlarged prostate, certain medications, strictures, or tumors.

  Monitoring for Urinary Retention

  • Urine output, signs of bladder distention, and bladder scans (a residual volume of 150 to 200 milliliters indicates the need for treatment).

  Urinary Catheters

  Indwelling Catheters

  These should be utilized cautiously and justified for conditions like:

  • Burns, neurogenic bladder, urinary shock or obstruction. It is important to note that urinary incontinence alone does not warrant catheter use.

  Risks

  Urinary catheters carry an increased risk of infection; thus, care must be taken to minimize this risk.

  Intermittent Catheterization

  This method is preferred as it reduces the risk of infection, and patients may be trained to self-catheterize.

  Suprapubic Catheters

  These are indwelling catheters inserted through the abdominal wall into the bladder. Care includes monitoring dressings, ensuring the site remains clean and dry, and securing the catheter appropriately to reduce tension.

  Practice Analysis Tip: Linking NCLEX-PN® to Practice

  Licensed practical nurses (LPN/LVN) are responsible for pivotal tasks in urinary care:

  • Collecting specimens for diagnostic tests (i.e., urine); checking for urinary retention via bladder scans, ultrasound, or palpation; insertions, maintenance, and removal of urinary catheters; as well as providing care aligned with bladder management protocols.

  Review Questions

  Review Question #1

  When should a nurse administer an antibiotic before collecting a urine specimen for culture and sensitivity?

  • Options:

    • Before collecting the urine specimen

    • After collecting the urine specimen

    • After obtaining the culture results

    • After reviewing the sensitivity report

  Review Question #2

  What post-procedure care should a nurse implement for a patient after a renal biopsy?

  • Options (select all that apply):

    • Monitor vital signs.

    • Observe for bleeding.

    • Monitor the biopsy site.

    • Monitor urine output.

    • Maintain NPO.

  Review Question #3

  Which patient statement demonstrates understanding of stress incontinence?

  • Options:

    • Occurs from impairment of physical/mental function

    • Involuntary loss of urine associated with bladder overdistention

    • Involuntary urine loss from increasing abdominal pressure

    • Involuntary urine loss with abrupt/strong desire to void

  Review Question #5

  What catheter care should a nurse provide for a patient after a suprapubic catheter insertion?

  • Options (select all that apply):

    • Apply antibiotic ointment on insertion site.

    • Cleanse insertion site daily.

    • Monitor dressings.

    • Monitor insertion site.

    • Monitor urine output.

    • Secure catheter.