用ETCO2及FiCO2监测调节Bain回路气量

观察小儿气管内麻醉时，用ＥＴＣＯ２及ＦｉＣＯ２监测调节Ｂａｉｎ回路的供气流量。２８例接受头面部手术的患儿静脉诱导插管后，吸入笑气－氧－安氟醚维持麻醉，气管导管连接Ｂａｉｎ回路系统，术中维持自主呼吸。麻醉平稳后，调节气体流量，视无ＣＯ２复吸入时之最小流量为理想流量，并记录所对应的ＥＴＣＯ２值。因为ＥＴＣＯ２接近肺泡ＣＯ２浓度，后者又接近ＰａＣＯ２，所以术中只要维持无ＣＯ２复吸入，就不会造成因此而出现的ＰａＣＯ２增高。而且，小儿患者无ＣＯ２复吸入之最小流量及自主呼吸所需气流量个体差异较大，所以术中监测ＥＴＣＯ２及ＦｉＣＯ２并以此指导供气量大小是无创、科学、安全可靠的。

USING ETCO 2 AND FiCO 2 TO ADJUST THE PROVIDED GAS FLOW OF BAIN CIRCUIT

In this group, we used ETCO 2 and FiCO 2 to adjust the provided gas flow of Bain circuit in paediatric endortacheal anesthesia 28 paediatric patients accepting N 2O O 2 enflurane inhalant anesthesia were selected After intravenous induction and intubation, the endotracheal tubes were connected with Bain System ,all of them remained spontaneously breathing When a smooth anesthesia was obtained, the gas flow was measured and the minimum flow of non CO 2 reinspiration was considered perfect flow Meanwhile, the corresponding ETCO 2 was recorded Because ETCO 2 is similar to alveolar CO 2 concentration, and the latter one is similar to PaCO 2, therefore, if we assured there was no CO 2 reinspired, there wouldn't be relevant increase of PaCO 2 Furthermore, the minimum flow of non CO 2 reinspiration and spontaneously breathing flow of paediatric patients have great differences among individuals, thus, using ETCO 2 and FiCO 2 during operation to direct the adjustment of gas flow is a method of non invasive, scientific, safe and reliable