Which symptom is most associated with left-sided heart failure?

• A. Shortness of breath
• B. Peripheral edema
• C. Ascites
• D. Hepatomegaly

Answer: (A)

Left-sided heart failure primarily causes fluid to back up into the lungs, so the most characteristic symptom is shortness of breath. When the left ventricle fails to eject efficiently, pressure builds in the left atrium and pulmonary veins. This raises the hydrostatic pressure in pulmonary capillaries, pushing fluid into the lung interstitium and air spaces, which impairs gas exchange and produces dyspnea, often with exertion, orthopnea, or paroxysmal nocturnal dyspnea.

Peripheral edema, ascites, and hepatomegaly arise from backup into the systemic (venous) circulation and are more typical of right-sided or bi-ventricular failure. They reflect systemic congestion rather than the primary pulmonary congestion seen with left-sided failure.