1 MCQs in Medicine for NEET PG
A 68-year-old male with a 50-year smoking history presents with severe dyspnea and a barrel-shaped chest. Pulmonary function testing shows FEV₁ 28% predicted, FEV₁/FVC 35%, and body plethysmography reveals TLC 140% predicted, RV 240% predicted, and RV/TLC ratio 68%. The spirometry pattern marked **A** in the diagram is consistent with which of the following pathophysiologic mechanisms?
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