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目的与方法：选择２２例术前肺功能正常和轻度损害肺叶切除手术的病人，观察单肺通气（ＯＬＶ）期间术侧肺加用Ｂａｉｎ环路行持续气道正压通气（ＣＰＡＰ）对Ｑｓ／Ｑｔ和氧合的影响。结果与结论：不用Ｂａｉｎ环路的Ⅰ组病人，术侧肺完全萎缩，ＰａＯ２、ＰＶＯ２均明显降低，分别为双肺通气（ＴＬＶ）时的６３％和７４％（Ｐ＜０．０５），Ａ－ａＤＯ２和Ｑｓ／Ｑｔ升高，说明低氧血症与ＯＬＶ时严重肺内分流有关。而在术侧肺加用Ｂａｉｎ环路者（Ⅱ组）上述变化表现极其轻微（Ｐ＞０．０５），这是因为氧能以一定的压力和流速持续吹入术侧肺泡，使其扩张并进行气体交换，在纠正低氧血症和降低Ｑｓ／Ｑｔ方面，其效果非常明显，且操作简便易行。
PURPOSE AND METHODS: Twenty-two patients undergoing preoperative pulmonary function tests with mild and moderate lobectomy were enrolled in this study. The effects of continuous positive airway pressure (CPAP) on the side of the lung during unilateral lung ventilation (OLV) / Qt and oxygenation. RESULTS AND CONCLUSION: Patients in group Ⅰ without Bain loop had a complete atrophy of the lateral lung and PaO2 and PVO2 were significantly decreased, 63% and 74% (P <0.05) of the double lung ventilation (TLV), respectively -aDO2 and Qs / Qt increased, indicating that hypoxemia and OLV severe pulmonary shunt related. However, the above changes were minimal (P> 0.05) in the patients who underwent Bain lobe surgery (group Ⅱ) because oxygen could be continuously inflated into the alveolar space at a certain pressure and flow rate to expand Gas exchange, in the correct hypoxemia and reduce Qs / Qt, the effect is very obvious, and easy to operate.