Relationships between impulse oscillometry spirometry and dyspnoea in COPD

Background: Severity of chronic obstructive pulmonary disease (COPD) is based either on symptoms/disability or lung function, which have no discernible correlation. We hypothesised that impulse oscillometry (IOS), a non-effortdependent measure of central and peripheral airway mechanics, could correlate to dyspnoea in COPD.Methods: We analysed screening data from 57 COPD patients who had spirometry, IOS and Medical Research Council dyspnoea score (MRC) measurements.