Question

Which of the following confirms the diagnosis of asthma or airway hyperresponsiveness? A. Exercise-induced bronchospasm in which FEV1 or FVC is ≥ 15% after exercise. B. Improvement of FEV1 and FEV1/FVC by ≥ 12% or 200 mL with the administration of a bronchodilator. C. At least a 20% drop in FEV1 from baseline (PC20) after provocative testing with methacholine, a nonspecific bronchial irritant. D. Eucapnic voluntary hyperventilation (EVH) showing a marked decrease in FEV1.

Answer 1

B. Improvement of FEV1 and FEV1/FVC by ≥ 12% or 200 mL with the administration of a bronchodilator confirms the diagnosis of asthma or airway hyperresponsiveness.