Methods A cross study on the expectorantive efficacy and safety of the pocket Flutter comparing with Mucosolvin,a new expectorantive,was performed in 60 patients with COPD.

• 方法在60例COPD患者中,以祛痰新药沐舒痰为对照,采用交叉设计方法评价了肺得宁的祛痰疗效及安全性。