1 MCQs in Medicine for NEET PG
A 58-year-old man with a 3-year history of progressive limb weakness and fasciculations is evaluated for dyspnea. Spirometry shows FEV1 = 72% predicted, FVC = 65% predicted, but MVV = 35 L/min (measured value). The pattern marked **A** in the diagram — disproportionate reduction in MVV relative to FEV1 — is demonstrated. Which of the following best explains this spirometric finding?
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