长期经口气管内插管（OETI）后可致喉损伤，但何以同样长的插管时间对一些人却不构成损伤？有些人即使损伤后也能迅速治愈？迄今未全明。为此该作者观察长期OETI后有哪些因素会促成损伤及如何减少和预防损伤发生。研究对象为无喉外伤及手术史，连续OETI超过3天以上的18岁以上男 Long-term oral endotracheal intubation (OETI) can cause laryngeal damage, but why the same length of intubation for some people do not constitute damage? Some people can be quickly cured even after injury? So far not all clear. For this reason, the authors observed after long-term OETI what factors can contribute to injury and how to reduce and prevent injury. The subjects were those who had no history of laryngotracheal trauma and surgery and were over 18 consecutive OETI for more than 3 days