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将我科 1990～ 1991年经治的先天性外耳道闭锁 4 9例分析如下。1 对象和方法1.1 对象 本组 4 9例 (5 6耳 )男 2 7例 (32耳 ) ,女 2 2例 (2 4耳 ) ;年龄 9～ 34岁 ,左侧 30耳 ,右侧 2 6耳。术前纯音测听 (以音频 5 0 0～ 2 0 0 0 Hz的平均阈值计 ) :5 6耳骨导为 15～ 35 d B
My department from 1990 to 1991 congenital external auditory canal atresia 49 cases were analyzed as follows. 1 objects and methods 1.1 object The group of 49 patients (56 ears) male 27 cases (32 ears), female 22 cases (24 ears); aged 9 to 34 years old, left 30 ears, right 26 ear. Preoperative pure tone audiometry (based on the average threshold value of the audio frequency of 500 ~ 2000 Hz): 56 osteotomy for 15 ~ 35 d B