However, in a study of 7 subjects, Killian et al found that dyspnea was the most prominent symptom limiting exercise performance in only % of patients with COPD and % of normal subjects.
However, in a study of 7 subjects, Killian et al found that dyspnea was the most prominent symptom limiting exercise performance in only % of patients with COPD and % of normal subjects.
然而，一项7例受试者参与的大样本研究显示，以呼吸困难为主要症状导致运动终止的COPD患者仅占％，这一比例与健康对照组(％)相当。