Gbjective : To study the safety and success rate of operating tracheoscopy .

前言：目的：研究 气管 镜操作 术的成功率和安全性。

Among the 6 cases with persistent inspiratory dyspnea four of them were diagnosed as congenital laryngocele by direct laryngoscope one case was diagnosed as subglottic stenosis by tracheoscopy and one case was confirmed to be thoracic tracheostenosis when tracheotomy performed .

6例持续性呼吸困难，直接喉镜检查确诊先天性会厌囊肿4例， 气管 镜 检查确诊声门下狭窄1例，气管切开时确诊胸段气管狭窄1例。