利用短声诱发耳声发射和听觉脑干反应对22例(44耳)因噪音引起的永久性听力下降者进行研究。患者均为男性,年龄37～64岁,平均51岁;双侧感音神经性聋。根据4kHz、3kHz、2kHz和1kHz纯音测听表将患者分为4组。第一组4例(8耳),平均年龄39岁,仅有4kHz听力下降;第二组7例(14耳),平均年 Twenty-two patients (44 ears) with permanent noise-induced hearing loss were studied using short-tone evoked otoacoustic emissions and auditory brain stem responses. Patients were male, aged 37 to 64 years, mean 51 years; bilateral sensorineural deafness. Patients were divided into 4 groups based on 4 kHz, 3 kHz, 2 kHz and 1 kHz pure tone audiodes. The first group of 4 patients (8 ears), mean age 39 years, only 4kHz hearing loss; the second group of 7 cases (14 ears), the average age