Keller C, Brimacombe J, Benzer A
Department of Anaesthesia and Intensive Care, University of Queensland, Cairns Base Hospital, Australia.
Br J Anaesth. 1999 Mar;82(3):399-401. doi: 10.1093/bja/82.3.399.
We have compared calculated with measured pharyngeal mucosal pressures at four different locations on the surface of the laryngeal mask airway (LMA) during cuff inflation in 10 anaesthetized, paralysed adult patients. Microchip sensors were attached to a size 5 LMA at the following locations: the anterior and lateral side, tip and backplate. Pressures were recorded during inflation of the cuff from 0 to 40 ml in 5-ml increments. Calculated pressures were determined by subtracting in vivo from in vitro intracuff pressures. Calculated pressures were greater than measured pressures at cuff volumes of 5 ml or greater at all locations (P < or = 0.003). The greatest mean calculated the measured pressures were 118 and 14 cm H2O, respectively. We conclude that measured mucosal pressures at the four locations tested were less than calculated pressures and less than capillary perfusion pressure.
我们比较了10例麻醉、瘫痪成年患者在喉罩气道（LMA）套囊充气时，LMA表面四个不同位置的计算咽黏膜压力与测量压力。微芯片传感器附着于5号LMA的以下位置：前侧和外侧、尖端和背板。套囊从0至40 ml以5 ml增量充气时记录压力。计算压力通过体外套囊内压力减去体内压力来确定。在所有位置，套囊容积为5 ml或更大时，计算压力均大于测量压力（P≤0.003）。计算压力与测量压力的最大平均差值分别为118和14 cmH₂O。我们得出结论，在所测试的四个位置，测量的黏膜压力低于计算压力且低于毛细血管灌注压力。
