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1980年Cotton和Seid介绍一种环状软骨前裂开术（ACS）的方法作为对手插管后不能技管的新生儿所选择的气管切开法。这种方法已不断得到普遍采用，适应症也放宽，包括患有声门下狭窄的年纪较大的儿童以及那些已行过气管造口术而不能拔管的儿童。复习1989年6月至1992年6月间对患有
In 1980, Cotton and Seid introduced a method of annular ankis kyphosis (ACS) as the tracheotomy method selected for neonates who can not manage after intubation. This method has been continuously adopted and the indications relaxed, including older children with subglottic stenosis and those who have undergone tracheostomy and can not be extubated. Review of the June 1989 to June 1992 for the patients