We hypothesized that static hyperinflation may be
more closely related to clinical dyspnea than laboratory
dyspnea, since there is a close relationship between the
IC and exercise performance and dyspnea in COPD.
The purpose of this observational study was to evaluate
the correlation between breathlessness during daily
activities measured using the Baseline Dyspnea Index
(BDI) and airflow limitation or static hyperinflation in
COPD.