Gorce P, Crisan A, Gondret R, Viallard M L, Clergue F
Service d'Anesthésie-Réanimation, Hôpital Tenon, Paris.
Ann Fr Anesth Reanim. 1994;13(5):741-4. doi: 10.1016/s0750-7658(05)80734-8.
The authors report a case of retropollution through the defective gas mixer of a Logic O4T-IMV ventilator (Ohmeda) located in the recovery room. Due to a defective check valve inside the mixer, medical air entered into the oxygen pipeline when the O2 pressure decreased below the pressure inside the medical air pipeline. This incident resulted in episodes of hypoxic gas mixture delivery in the operating theatre, when nitrous oxide was associated with oxygen polluted with medical air. The occurrence of such an incident, rarely described so far, requires the association of several factors. It can be recognized without delay with the continuous use of an oxygen analyser.
作者报告了一例发生在恢复室的、由一台Logic O4T - IMV呼吸机（Ohmeda公司生产）的气体混合器故障导致的逆向污染事件。由于混合器内部的止回阀故障，当氧气压力降至低于医用空气管道内的压力时，医用空气进入了氧气管道。这一事件导致在手术室中，当一氧化二氮与被医用空气污染的氧气混合时，出现了低氧气体混合物输送的情况。这种事件迄今为止很少被描述，其发生需要多种因素共同作用。通过持续使用氧气分析仪可以立即识别该事件。
