目的:探讨超声测量小儿声门下气道横径的方法，并评估其用于指导小儿无囊及有囊气管导管选择的临床效果。 方法:该实验分两阶段进行，第一阶段探讨超声测量法用于无囊气管导管的选择，共纳入行择期手术需气管插管的6个月～6岁患儿45例，第二阶段探讨超声测量法用于有囊气管导管的选择，共纳入行择期手术需气管插管的6个月～6岁患儿40例。通过超声测量声门下气道横径选择气管导管；插管后视临床实际情况决定是否更换导管，至临床插管成功（临床最适导管）；同时应用年龄公式法计算每位患儿的气管导管型号。以临床最适导管型号为标准，计算超声测量法与年龄公式法选择导管的准确率，并对其差异性进行统计学分析；分别对声门下气道横径、...Objective: To evaluate the clinical effect of measuring pediatric subglottic diameter under ultrasound for the endotracheal tube size selection in a pediatric population. Methods: The research included two steps. The first step was about the uncuffed endotracheal tube. A total 45 pediatric patients who were scheduled for surgery and undergoing tracheal intubation were enrolled. The second step was...学位：医学硕士院系专业：医学院_麻醉学学号：2452014115357
