1 MCQs in Medicine for NEET PG
A 63-year-old man with a 45 pack-year smoking history presents with progressive dyspnea on exertion. Pulmonary function testing shows FEV1 1.85 L (58% predicted), FVC 3.10 L (68% predicted), and FEV1/FVC ratio 0.60. After the forced spirometry maneuver, slow vital capacity (SVC) is measured at 3.85 L (85% predicted). The structure marked **A** in the diagram demonstrates that SVC exceeds FVC by more than 200 mL. What is the primary pathophysiological mechanism underlying this discrepancy in a patient with emphysema?
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