In heart failure, which medication is commonly used to reduce preload and pulmonary congestion?

Choice A rationale Beta-blockers are used in heart failure to reduce myocardial oxygen demand and improve left ventricular ejection fraction. However, they are not the primary choice for immediate reduction of preload and pulmonary congestion, which are more effectively addressed by medications that directly reduce fluid volume. Choice B rationale Diuretics, such as loop diuretics like furosemide, are commonly used in heart failure to reduce preload by increasing sodium and water excretion from the body. This reduction in intravascular volume decreases venous return to the heart, thereby lowering pulmonary congestion and relieving symptoms like dyspnea and edema. Choice C rationale ACE inhibitors (angiotensin-converting enzyme inhibitors) are foundational for long-term heart failure management. They reduce afterload and slow disease progression by inhibiting the renin-angiotensin-aldosterone system. While they have some effect on fluid balance, they are not as effective as diuretics for rapid preload reduction and symptom relief. Choice D rationale Calcium channel blockers are generally not recommended for systolic heart failure. While some can reduce afterload, most may have negative inotropic effects, which could worsen heart failure symptoms by weakening the heart's pumping action. Their use is limited in specific types of heart failure.