Lundi J N, Populaire C, Malinge M, Carteau S, Nguyen V G, Souron R
Département d'Anesthésie-Réanimation, Hôtel-Dieu, Nantes.
Ann Fr Anesth Reanim. 1987;6(6):528-32. doi: 10.1016/s0750-7658(87)80100-4.
Thirty-six patients were anaesthetized for a maxillofacial surgical procedure. Ventilation was controlled by a ventilator (Kontron ABT 4100) with a semi-closed circle system. The flow of fresh gases was 1,200 ml.min-1. The vaporizer for the halogenated anaesthetic agent was placed out of the circle before the ventilator. Halothane was used for maintenance of anaesthesia and isoflurane for induced hypotension in orthognathic surgery. The inspired concentration of the halogenated agent was monitored by an analyser. A linear correlation between the delivered and the inhaled concentration of halogenated agent was established, the latter never reaching the delivered concentration. Monitoring the inspired oxygen concentration was required, so as to maintain a constant value. Carbon dioxide absorption by soda lime was also studied. The known advantages were: substantial economies in nitrous oxide and halogenated agents, prevention of contamination of the operating theatre, humidification and warning of the inspired gases. The use of such a system with the vaporizer out of the circle was safe, all the more so as the concentration of inhaled halogenated agents could be predicted.
三十六名患者接受了颌面外科手术麻醉。通气由带有半封闭环路系统的呼吸机（康强ABT 4100）控制。新鲜气体流量为1200 ml·min⁻¹。用于卤化麻醉剂的蒸发器置于呼吸机之前的环路外。氟烷用于维持麻醉，异氟烷用于正颌外科手术中的诱导性低血压。卤化剂的吸入浓度由分析仪监测。确定了卤化剂输送浓度与吸入浓度之间的线性相关性，后者从未达到输送浓度。需要监测吸入氧浓度以维持恒定值。还研究了碱石灰对二氧化碳的吸收。其已知优点包括：显著节省氧化亚氮和卤化剂、防止手术室污染、对吸入气体进行加湿和警示。使用这种蒸发器置于环路外的系统是安全的，特别是因为吸入卤化剂的浓度可以预测。
