Objective To estimate the efficacy of noninvasive positive pressure ventilation in COPD with severe hypercapnic respiratory failure.
目的观察双水平无创正压通气对慢性阻塞性肺病（COPD）并发严重呼吸衰竭患者的治疗作用。
Objective To estimate the efficacy of noninvasive positive pressure ventilation in COPD with severe hypercapnic respiratory failure.
目的观察双水平无创正压通气对慢性阻塞性肺病（COPD）并发严重呼吸衰竭患者的治疗作用。
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