Cardiovascular Disorders & Heart Failure
Hemodynamic pathophysiology of left vs right-sided heart failure, cardiogenic shock cues, BNP biomarkers, and preload/afterload reduction strategies.
High-Yield Clinical Takeaways & NCLEX Priorities
- Left-sided HF manifests as pulmonary congestion (crackles, dyspnea, orthopnea, paroxysmal nocturnal dyspnea).
- Right-sided HF manifests as systemic venous congestion (jugular venous distension, dependent peripheral edema, hepatomegaly, ascites).
- B-type Natriuretic Peptide (BNP) > 100 pg/mL signals ventricular stretch and acute decompensation.
- Weight monitoring benchmark: Report weight gain > 2–3 lbs in 24 hours or > 5 lbs in one week immediately.
1. Pathophysiology and Differential Clinical Cues
Heart failure represents the inability of the myocardial pump to sustain adequate cardiac output for metabolic tissue demands. Left ventricular dysfunction results in retrograde hydrostatic pressure elevation across pulmonary capillaries, forcing fluid transudation into alveoli. In contrast, right ventricular dysfunction leads to systemic venous pooling.
Essential Nursing Action Items:
- •Left-sided failure signs: Bibasilar crackles, tachypnea, pink frothy sputum, S3 gallop, dry hacking cough.
- •Right-sided failure signs: Peripheral pitting edema, elevated JVD at 45 degrees, abdominal bloating, RUQ tenderness.
Acute alveolar flooding produces severe air hunger and blood-tinged, pink frothy sputum. Immediate priority interventions: High Fowler position with legs dependent, high-flow supplemental oxygen, IV loop diuretics, and sublingual/IV nitroglycerin to drop preload.
2. Pharmacotherapy & Nursing Considerations
Pharmacologic management centers on neurohormonal inhibition and hemodynamic optimization. ACE inhibitors and ARBs attenuate ventricular remodeling. Beta-blockers (carvedilol, metoprolol succinate) reduce sympathetic drive but must only be started when the patient is euvolemic.
Essential Nursing Action Items:
- •Furosemide / Bumetanide: Monitor for hypokalemia (potassium < 3.5 mEq/L) which sensitizes the myocardium to lethal arrhythmias and digitalis toxicity.
- •Spironolactone (Aldosterone Antagonist): Spares potassium; closely track for hyperkalemia and renal insufficiency (serum creatinine > 2.0 mg/dL).
- •Digoxin (Inotrope): Therapeutic range is 0.5–0.9 ng/mL for HF. Check apical pulse for 60 full seconds prior to administration; hold if pulse < 60 bpm in adults.
Early signs of digoxin toxicity are gastrointestinal (anorexia, nausea, vomiting) and neurologic (fatigue, headache, visual yellow/green halos). Hypokalemia markedly increases digitalis toxicity risk even at 'normal' blood levels.
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