Yam P C, Carli F
Department of Anaesthesia, Northwick Park Hospital and Clinical Research Centre, Harrow, Middlesex.
Anaesthesia. 1990 Jul;45(7):563-5. doi: 10.1111/j.1365-2044.1990.tb14832.x.
The effect of a heat and moisture exchanger on intra-operative aural canal (core) and mean skin temperatures was investigated in elderly patients who had elective total hip arthroplasty under general anaesthesia with artificial ventilation of the lungs. Group 1 (n = 20) did not receive any form of artificial humidification while in group 2 (n = 20) a heat and moisture exchanger was inserted in the breathing system and in group 3 (n = 20) the inspired gases were humidified and warmed at 40 degrees C by means of a heated humidifier. Time of surgery, intravenous fluid administration and operating theatre temperature were standardised. Mean (SD) aural canal (core) temperature decreased significantly in groups 1 and 2 (p less than 0.001), while there was a fall of 0.3 degrees C (0.6) in group 3, which was not significant. Mean skin temperature decreased during anaesthesia and surgery in both groups 1 and 2 (p less than 0.05), while it increased in group 3. There was a significantly greater loss of body heat in groups 1 and 2 compared with group 3 intra-operatively (p less than 0.001). We conclude tha a heat and moisture exchanger did not prevent the decrease in intra-operative body temperature in elderly patients.
在接受全身麻醉并进行人工肺通气的择期全髋关节置换术的老年患者中，研究了热湿交换器对术中耳道（核心）温度和平均皮肤温度的影响。第1组（n = 20）未接受任何形式的人工加湿，而第2组（n = 20）在呼吸系统中插入了热湿交换器，第3组（n = 20）通过加热加湿器将吸入气体加湿并加热至40摄氏度。手术时间、静脉输液量和手术室温度均标准化。第1组和第2组的平均（标准差）耳道（核心）温度显著下降（p < 0.001），而第3组下降了0.3摄氏度（0.6），差异不显著。第1组和第2组在麻醉和手术期间平均皮肤温度下降（p < 0.05），而第3组则升高。与第3组相比，第1组和第2组在术中的体热损失显著更大（p < 0.001）。我们得出结论，热湿交换器并不能防止老年患者术中体温下降。
