小儿先心病矫治术后早期发生呼吸功能不全是体外循环（ＣＰＢ）后的严重并发症之一。本文通过监测小儿左向右分流型先心病手术期间ＣＰＢ前后的动脉血二氧化碳分压（ＰａＣＯ２），呼气末二氧化碳分压（ＰＥＴＣＯ２）和两者的差值（Ｐａ－ＥＴＣＯ２），以及肺通气量（ＶＴ Early congenital heart disease correction of respiratory dysfunction occurs after cardiopulmonary bypass (CPB) one of the serious complications. In this paper, by monitoring the partial pressure of arterial carbon dioxide (PaCO2), the difference between the end-tidal carbon dioxide (PETCO2) and the difference between the two before and after CPB (Pa-ETCO2) during the operation of pediatric left-right shunt congenital heart disease, Ventilation (VT