Objective To compare the ProSeal laryngeal mask airway (PLMA) and the standard laryngeal mask airway (SLMA) for intermittent positive pressure ventilation (IPPV) in a randomized auto control design.

• 目的采用随机自身对照设计方法比较食管引流型喉罩通气道（PLMA）和标准型喉罩通气道（SLMA）用于间歇正压通气的有效性。