Objective:To discuss the difference of vital capacity(VC), expiratory reserve volume(ERV) and inspiratory capacity(IC) in chronic obstructive pulmonary disease(COPD) patients and the normal subjects after breathing helium-oxygen mixtures (heliox).

• 目的 探讨慢性阻塞性肺病 (COPD)患者呼吸氦氧混合气 (He -O2 )后肺活量 (VC)及其组成补呼气容积 (ERV)和深吸气量 (IC)的变化与健康人的差异。