Left-sided congestive heart failure is best described by which primary consequence?

• A. It backs up fluid in the peripheral veins causing ankle swelling
• B. It backs up fluid into the lungs causing pulmonary edema
• C. It causes hepatic congestion
• D. It improves with rest

Answer: (B)

Left-sided heart failure primarily causes fluid to back up into the lungs, leading to pulmonary edema. When the left ventricle can’t eject blood effectively, pressure rises in the left atrium and pulmonary veins. This elevated pressure pushes fluid from the capillaries into the lung interstitium and alveoli, impairing gas exchange and producing symptoms like shortness of breath, especially when lying flat, along with crackles on auscultation. Peripheral edema and liver congestion are more typical of right-sided failure, though both sides can be involved in advanced disease. The issue isn’t improvement with rest; it’s the elevated pressures and fluid in the lungs that define the left-sided problem.