A 68-year-old male smoker presents with a 2-month history of productive morning cough and worsening exertional dyspnea. Spirometry reveals a post-bronchodilator FEV1/FVC ratio of 0.58 and an FEV1 of 65% of predicted. What is the definitive diagnostic interpretation of these pulmonary function findings according to GOLD guidelines?
Answer and explanation
Correct answer: D. Chronic obstructive pulmonary disease (COPD)
- Step 1: Interpret spirometric ratios: A post-bronchodilator establishes persistent, non-reversible airflow limitation.
- Step 2: In a patient with substantial cigarette smoking exposure, this confirms the diagnosis of Chronic Obstructive Pulmonary Disease (COPD, GOLD Grade 2 moderate obstruction).
Answer
Chronic obstructive pulmonary disease (COPD).
Why not the others: 'Bronchial asthma' demonstrates significant acute bronchodilator reversibility (FEV1 increase > 12% and > 200 mL); 'Idiopathic pulmonary fibrosis' is a restrictive lung disease characterized by a preserved or elevated FEV1/FVC ratio (> 0.70) with reduced TLC; 'Normal physiology' maintains FEV1/FVC above 0.70.
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