Which patient is most consistent with left‑sided heart failure?

• A. 72-year-old female with crackles in dependent lung fields
• B. 42-year-old female with a BP difference between arms
• C. 56-year-old male with pulsus paradoxus
• D. 86-year-old male with edema in ankles and fingers

Answer: (A)

Left-sided heart failure causes fluid to back up into the lungs, raising pressure in the pulmonary capillaries and leading to pulmonary edema. That fluid in the alveoli produces crackles heard on exam and symptoms like shortness of breath. The elderly patient described as having crackles in the dependent lung fields fits this pattern best, because crackles reflect pulmonary congestion from left-sided failure.

The other scenarios point to different problems: a blood pressure discrepancy between arms suggests a vascular issue such as a dissection; pulsus paradoxus is associated with tamponade or severe airway obstruction; and edema in the ankles and fingers points more toward right-sided heart failure or generalized fluid overload, not isolated left-sided failure.