机械通气是抢救、治疗慢性阻塞性肺疾病（COPD）慢性呼吸衰竭急性加重的重要方法。近年来，随着压力支持通气的应用，已有研究用无创伤机械通气治疗COPD合并呼吸衰竭的报道。我科于1994年10月至1995年5月，对20例COPD合并刀型呼吸衰竭患者用BIPAP呼吸机经鼻（口鼻）面登通气治 Mechanical ventilation is an important method to rescue and treat acute exacerbations of chronic respiratory failure in patients with chronic obstructive pulmonary disease (COPD). In recent years, with the use of pressure-supported ventilation, there have been reports of noninvasive mechanical ventilation in the treatment of COPD with respiratory failure. Our department from October 1994 to May 1995, 20 cases of COPD patients with respiratory failure patients with BIPAP ventilator nasal (nose and mouth) Dengden ventilation treatment