1 MCQs in Medicine for NEET PG
A 52-year-old man presents 4 months after radiofrequency catheter ablation for paroxysmal atrial fibrillation with progressive exertional dyspnea, hemoptysis, and persistent cough. Spirometry shows FVC 65%, FEV1 68%, and the FEV1/FVC ratio marked as **C** is 0.85. DLCO is significantly reduced at 55% predicted. CT pulmonary angiography reveals severe ostial stenosis of the right superior pulmonary vein with downstream parenchymal congestion and interstitial edema. Which of the following best explains why the FEV1/FVC ratio marked **C** remains preserved/elevated despite the restrictive spirometric pattern in this patient?
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