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MBBS QUESTION #10249
Question 1
Restrictive lung disease (e.g., pulmonary fibrosis) characteristically produces which spirometric pattern?
  • Reduced FEV1/FVC ratio with increased total lung capacity
  • A normal or increased FEV1/FVC ratio, with reduced total lung capacity and reduced forced vital capacity✔️
  • A normal FEV1/FVC ratio with a normal total lung capacity
  • Markedly increased residual volume with a normal forced vital capacity
Correct Answer Explanation
In restrictive disease, both FEV1 and FVC fall roughly in proportion (or FEV1 falls less than FVC), so the FEV1/FVC ratio is normal or even increased, while total lung capacity and vital capacity are reduced due to stiff, poorly compliant lungs — distinguishing it from the obstructive pattern.