Barnes P K, Seeley H F, Gothard J W, Conway C M
Anaesthesia. 1976 Nov;31(9):1248-53. doi: 10.1111/j.1365-2044.1976.tb11980.x.
The Lack anaesthetic system is a coaxial modification of the Magill circuit. The resistance of the system was found to be unacceptably high. When air was administered through the system to spontaneously breathing trained volunteers, marked evidence of rebreathing was present when fresh gas flow equalled minute volume. It is suggested that a fresh gas glow equal to one and a half-times minute volume would be required to prevent rebreathing of alveolar gas.
拉克麻醉系统是马吉尔回路的一种同轴改良型。发现该系统的阻力高得令人无法接受。当通过该系统向自主呼吸的训练有素的志愿者输送空气时，当新鲜气流等于分钟通气量时，有明显的重复呼吸迹象。有人建议，需要等于分钟通气量1.5倍的新鲜气流来防止肺泡气的重复呼吸。
