经面罩机械通气治疗ＣＯＰＤ呼吸衰竭疗效肯定[1,2]。国外推荐作为轻中度患者的一线治疗手段[3]。我们也曾比较经面罩机械通气治疗重症昏迷患者和轻中度患者的疗效,结果相似[4]。但目前尚无系统性报道动脉血二氧化碳分压(ｐａ,ＣＯ2)皆大于13.3ｋＰａ(100ｍｍＨｇ)的资料。我们 The mask mechanical ventilation for the treatment of COPD respiratory failure certainly [1,2]. Foreign recommended as a first-line treatment of patients with mild to moderate [3]. We also compared the efficacy of mask ventilation to treat patients with severe coma and mild to moderate patients with similar results [4]. However, there is no systematic report that the arterial partial pressure of carbon dioxide (pa, CO2) is greater than 13.3 kPa (100 mmHg). we