1 MCQs in Medicine for NEET PG
A 56-year-old man with motor neuron disease (ALS) presents with progressive orthopnea and inability to sleep flat. Sitting spirometry shows FVC 65%. When spirometry is repeated in the supine position, the FVC drops to 38%. The finding marked **B** in the diagram—a supine loop with reduced VC >25%—is characteristic of which underlying pathophysiology?
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