학술논문
Worldwide patterns of bronchodilator responsiveness: results from the Burden of Obstructive Lung Disease study.
Document Type
Article
Author
Source
Subject
*BRONCHODILATOR agents
*OBSTRUCTIVE lung diseases patients
*SPIROMETRY
*PULMONARY function tests
*MEDICAL care
*MEDICAL research
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Language
ISSN
0040-6376
Abstract
RationaleCriteria for a clinically significant bronchodilator response (BDR) are mainly based on studies in patients with obstructive lung diseases. Little is known about the BDR in healthy general populations, and even less about the worldwide patterns.Methods10â360 adults aged 40â
years and older from 14 countries in North America, Europe, Africa and Asia participated in the Burden of Obstructive Lung Disease study. Spirometry was used before and after an inhaled bronchodilator to determine the distribution of the BDR in population-based samples of healthy non-smokers and individuals with airflow obstruction.ResultsIn 3922 healthy never smokers, the weighted pooled estimate of the 95th percentiles (95% CI) for bronchodilator response were 284â
ml (263 to 305) absolute change in forced expiratory volume in 1 s from baseline (ÎFEV1); 12.0% (11.2% to 12.8%) change relative to initial value (%ÎFEV1i); and 10.0% (9.5% to 10.5%) change relative to predicted value (%ÎFEV1p). The corresponding mean changes in forced vital capacity (FVC) were 322â
ml (271 to 373) absolute change from baseline (ÎFVC); 10.5% (8.9% to 12.0%) change relative to initial value (ÎFVCi); and 9.2% (7.9% to 10.5%) change relative to predicted value (ÎFVCp). The proportion who exceeded the above threshold values in the subgroup with spirometrically defined Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage 2 and higher (FEV1/FVC <0.7 and FEV1% predicted <80%) were 11.1%, 30.8% and 12.9% respectively for the FEV1-based thresholds and 22.6%, 28.6% and 22.1% respectively for the FVC-based thresholds.ConclusionsThe results provide reference values for bronchodilator responses worldwide that confirm guideline estimates for a clinically significant level of BDR in bronchodilator testing. [ABSTRACT FROM AUTHOR]