Hoffman S, Freedman M
Br J Anaesth. 1976 Oct;48(10):1025-8. doi: 10.1093/bja/48.10.1025.
Delayed onset of obstruction in the Oxford endotracheal tube during anaesthesia is described in five patients. The effects of intra-cuff voluem and pressure on the wall of the tube were investigated and discussed with special refernce to the ffects of body heat and repeated use on the consistency of the tube. It is concluded that inward collapse of the tube wall is caused by a combination of factors, namely: frequent use, softening of the tube wall by body heat, the gradual increasing of intra-cuff volume and pressure by diffusion of nitrous oxide into the cuff, replacing a damaged cuff by a new one and heat sterilization. Deflation and re-inflation of the cuff to minimal occlusive volume at hourly intervals is suggested as a precautionary measure in the prevention of inward collapse of the tube wall.
本文描述了5例麻醉期间牛津气管内导管延迟出现梗阻的情况。研究并讨论了套囊内体积和压力对导管壁的影响，并特别提及了体温和反复使用对导管质地的影响。得出的结论是，导管壁向内塌陷是由多种因素共同作用引起的，这些因素包括：频繁使用、体温使导管壁变软、氧化亚氮扩散到套囊中导致套囊内体积和压力逐渐增加、用新套囊替换损坏的套囊以及热消毒。建议每隔一小时将套囊放气并重新充气至最小闭合容量，作为预防导管壁向内塌陷的预防措施。
