1 MCQs in Medicine for NEET PG
A 68-year-old male former shipyard worker presents with a 5-year history of progressive exertional dyspnoea (MMRC grade 3) and persistent dry cough. He installed pipe insulation from 1965–1995 (30-year occupational asbestos exposure). Chest X-ray shows bilateral lower-zone reticulonodular opacities with calcified pleural plaques. Fine end-inspiratory crackles are heard at both lung bases. Spirometry is performed. The pattern marked **C** in the diagram shows basal restrictive disease with reduced FVC, preserved FEV1/FVC ratio, and reduced DLCO. Which of the following best explains the physiological basis of the reduced DLCO in this patient's spirometry pattern?
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