to investigate the hypothesis that clinical methods and psychophysical testing provide different information about breathlessness , we compared dyspnea ratings from a modified medical research council ( mrc ) scale , the oxygen-cost diagram ( ocd ) , and the baseline dyspnea index ( bdi ) with the perceived magnitude of added loads in 24 patients with obstructive airway disease ( oad ) who experienced dyspnea on exertion .
C0030054
oxygen
C0600260
obstructive airway disease