Methods:Using Bicore CP100 respiratory function monitor,changes in work of breathing were measured in 22 patients during continuous positive airway pressure (CPAP),T tube,pressure support ventilation (PSV),and at 2 hours after tube extraction.

• 方法：通过BicoreCP100呼吸监测仪测定22例患者在压力支持通气（PSV）、持续气道内正压（CPAP）通气、T管及拔管后2小时等条件下的呼吸功的变化。