Restrictive Lung Disease USMLE Step 1 Practice Question
A 61-year-old woman with a 5-year history of idiopathic pulmonary fibrosis presents with progressive dyspnea. Vital signs show BP 138/82 mmHg, HR 102 bpm, RR 22/min, SpO2 88% on room air. Pulmonary function testing reveals decreased total lung capacity and proportionally reduced FEV1 and FVC (FEV1/FVC ratio 0.78). High-resolution CT confirms bilateral lower lobe fibrosis. She denies orthopnea. Which spirometric pattern best describes these findings?
Answer choices
- ARestrictive ventilatory defectCorrect answer
- BCommunity acquired pneumonia
- CPleural effusion
- DPulmonary embolism
- EObstructive ventilatory defect
- FMixed ventilatory defect with predominant obstructive component
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