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Antihypertensive Medications: Diuretics | 마이메르시 MyMerci
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Antihypertensive Medications: Diuretics

NCLEX Review Guide: Antihypertensive Medications - Diuretics

Diuretic Classifications & Mechanisms

Thiazide and Thiazide-Like Diuretics

  • Hydrochlorothiazide (HCTZ) and Chlorthalidone work by blocking sodium and chloride reabsorption in the distal convoluted tubule. They are first-line agents for hypertension management and provide cardiovascular protection beyond blood pressure reduction.
  • Mechanism: Inhibit NaCl cotransporter, leading to increased sodium, chloride, and water excretion while promoting calcium retention and magnesium/potassium loss.

Loop Diuretics

  • Furosemide (Lasix) and Bumetanide are high-ceiling diuretics that block the Na-K-2Cl cotransporter in the ascending limb of the loop of Henle. They produce rapid, potent diuresis and are used for heart failure and fluid overload.
  • Critical Alert: Can cause severe dehydration, electrolyte imbalances, and ototoxicity with high doses or rapid IV administration.

Potassium-Sparing Diuretics

  • Spironolactone (aldosterone receptor antagonist) and Amiloride (ENaC blocker) prevent potassium loss while promoting sodium excretion. Often combined with other diuretics to prevent hypokalemia.
  • Key Benefit: Reduce mortality in heart failure patients and help maintain potassium balance when used with thiazide or loop diuretics.

Key Points

  • Thiazides are first-line for hypertension; loops for heart failure
  • All diuretics can cause dehydration and electrolyte imbalances
  • Monitor potassium levels closely with all diuretic therapy

Nursing Considerations & Monitoring

Essential Assessments

  1. Monitor daily weights (same time, same scale, same clothing) - weight gain >2-3 lbs in 24 hours indicates fluid retention
  2. Assess intake and output, noting urine color, amount, and frequency
  3. Monitor vital signs, especially blood pressure and heart rate for hypotension
  4. Evaluate electrolyte levels: sodium, potassium, magnesium, and chloride

Clinical Scenario

A 68-year-old patient with heart failure is prescribed furosemide 40mg PO daily. After 3 days, they report dizziness when standing and muscle cramps. Priority nursing action: Check orthostatic vital signs and obtain electrolyte panel to assess for hypokalemia and dehydration.

Memory Aid: DIURETIC

  • Dehydration risk
  • Intake/Output monitoring
  • Urine output increase expected
  • Renal function assessment
  • Electrolyte imbalances
  • Take in morning to avoid nocturia
  • Increased fall risk (hypotension)
  • Cardiac monitoring needed

Key Points

  • Administer morning doses to prevent sleep disruption
  • Assess for signs of dehydration: dry mucous membranes, poor skin turgor
  • Monitor for drug interactions, especially with digoxin and lithium

Side Effects & Contraindications

Common Side Effects by Diuretic Type

ThiazidesLoop DiureticsPotassium-Sparing
Hypokalemia, Hyperuricemia, HyperglycemiaSevere dehydration, Ototoxicity, HyponatremiaHyperkalemia, Gynecomastia (spironolactone)

Critical Contraindications

  • Thiazides: Severe renal impairment, anuria, hypersensitivity to sulfonamides
  • Loop Diuretics: Anuria, severe electrolyte depletion, hypersensitivity
  • Potassium-Sparing: Hyperkalemia (K+ >5.0), severe renal impairment, concurrent ACE inhibitor use requires careful monitoring

Key Points

  • Thiazides may worsen diabetes and gout
  • Loop diuretics require hearing assessment with prolonged use
  • Potassium-sparing diuretics can cause dangerous hyperkalemia

Patient Education & Safety

Essential Teaching Points

  • Take medication in the morning to avoid nighttime urination and sleep disruption. Timing is crucial for patient compliance and quality of life.
  • Rise slowly from sitting or lying positions to prevent orthostatic hypotension and falls. Fall prevention is a priority nursing concern.
  • Maintain adequate fluid intake unless contraindicated, and consume potassium-rich foods if taking thiazide or loop diuretics (bananas, oranges, spinach).
  • Report signs of electrolyte imbalance: muscle cramps, weakness, irregular heartbeat, or confusion immediately to healthcare provider.

Patient Safety Mnemonic: FLUID

  • Fall prevention (orthostatic precautions)
  • Lab values monitoring
  • Urination patterns (frequency, nocturia)
  • Intake adequate fluids
  • Daily weights same time

Key Points

  • Emphasize compliance - sudden discontinuation can cause rebound hypertension
  • Teach recognition of dehydration and electrolyte imbalance symptoms
  • Stress importance of regular follow-up for lab monitoring

Quick Check - Self Assessment

I can identify the three main classes of diuretics and their mechanisms
I understand key nursing assessments for patients on diuretic therapy
I can recognize signs of electrolyte imbalances
I know essential patient teaching points for diuretic safety

Common Pitfalls

  • ❌ Forgetting that potassium-sparing diuretics can cause HYPERkalemia, not hypokalemia
  • ❌ Not considering drug interactions with digoxin (increased toxicity risk with hypokalemia)
  • ❌ Overlooking the need for gradual dose adjustments in elderly patients

Remember: You've got this! Diuretics are fundamental to cardiovascular care. Master the mechanisms, monitoring, and safety considerations, and you'll confidently handle any NCLEX question about these life-saving medications. Every patient you care for benefits from your thorough understanding! 💪

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