Objective: The GOLD guidelines suggest that the presence of a post-bronchodilator forced expiratory volume in one second (FEV 1 ) Ͻ 80% of the predicted value in combination with a FEV 1 /forced vital capacity (FVC) Ͻ 70% confi rms the diagnosis of COPD. Limited data exist regarding the accuracy of these criteria to distinguish between COPD and asthma. The aim of this study therefore was to investigate the diagnostic value of post-bronchodilator lung function parameters in obstructive lung disease.
Methods:The pulmonary function tests of 43 (22 = COPD, 21 = asthma) patients with similar baseline characteristics were evaluated (baseline FEV 1 were 55.7% + 7.6%, and 59.3% + 8.4% predicted for COPD and asthma, respectively). Bronchodilator responsiveness (BDR) was calculated according to three recognized pulmonary function test criteria. Results: The first criteria, post-bronchodilator FEV 1 Ͻ 80% of the predicted value in combination with a post-bronchodilator FEV 1 /FVC ratio of Ͻ70%, had an accuracy of 70% to diagnose COPD. This combination was very sensitive (100%) in diagnosing COPD, but it was not specifi c (38%). The second BDR criteria, defi ned as an increase of Ͻ12% and 200 mL of initial FEV 1 and criterion number 3, an increase of Ͻ9% of predicted FEV 1 , were less sensitive (55% and 59%, respectively), but more specifi c (81% and 76% respectively) to diagnose COPD. Our fi ndings suggest that the current recommended spirometric indices are not optimal in differentiating between COPD and asthma.