McIntyre J W, Purdham J T, Hosein H R
Can Anaesth Soc J. 1978 Nov;25(6):499-505. doi: 10.1007/BF03007413.
This study was designed to assess operating room contamination with nitrous oxide and halothane when nitrous oxide 3 1/min and oxygen 2 1/min containing halothane one per cent were passed into a semiclosed circle absorber system from which the patients' lungs were ventilated with an Ohio ventimeter through a cuffed tracheal tube, with the exhaled gas vented to the floor. The normal room ventilation did not consistently maintain levels below the suggested amounts, which are nitrous oxide 25 ppm and halothane 2 ppm. Careful daily check for and correction of high and low pressure leaks combined with the use of a Foregger scavenging device (7--351--005) and continuous wall vacuum accepting approximately 22 1/min enabled geometric mean values below the suggested levels to be achieved. The Protection Filter Foregger 7--365--001 was only effective in removing halothane and only if the plastic holder provided was radically modified. Attention is drawn to the numerous factors influencing the magnitude of contamination, aspects of controlling it, and the necessity to cope with the problem of dealing with scavenged gases and vapours.
本研究旨在评估当每分钟3升氧化亚氮和每分钟2升含1%氟烷的氧气通入半封闭循环吸收系统时，手术室中氧化亚氮和氟烷的污染情况。在该系统中，患者肺部通过带套囊的气管导管经俄亥俄通气计进行通气，呼出气体排至地面。正常的室内通风并不能始终将水平维持在建议值以下，建议值为氧化亚氮25 ppm和氟烷2 ppm。每天仔细检查并纠正高低压泄漏，同时使用福尔格废气清除装置（7 - 351 - 005）以及持续的墙壁真空（每分钟约接受22升），能够使几何平均值达到建议水平以下。福尔格保护过滤器7 - 365 - 001仅在对所提供的塑料支架进行彻底改造后，才对去除氟烷有效。文中提请注意影响污染程度的众多因素、控制污染的各个方面，以及应对处理清除的气体和蒸汽问题的必要性。
