Objective To compare the effects of ipratropium bromide(IPB),salbuta(SA) and combivent(CB) on bronchodilation in patients with severe COPD by mechanical ventilation.

• 目的比较可必特气雾剂、溴化异丙托品气雾剂以及沙丁胺醇气雾剂对应用机械通气的重度慢性阻塞性肺疾病患者的支气管扩张作用。