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MBBS QUESTION #10248
Question 1
Spirometry in a patient shows a reduced FEV1/FVC ratio (below 70%) with a normal or increased total lung capacity. This pattern is characteristic of:
  • Obstructive lung disease (e.g., COPD, asthma)✔️
  • Restrictive lung disease (e.g., pulmonary fibrosis)
  • Entirely normal lung function
  • Pure respiratory muscle weakness with normal airway caliber
Correct Answer Explanation
A disproportionately reduced FEV1 relative to FVC (low FEV1/FVC ratio) reflects airway obstruction, limiting rapid expiratory airflow; total lung capacity is often preserved or increased (air trapping/hyperinflation), classic for obstructive diseases like COPD and asthma.