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目的 :探讨一组以言语听力下降为主的听力损失的命名、临床特点、病损部位。方法 :分析 11例低频或以低频为主的感音神经性听力损失患者的临床症状、纯音测听、声导抗测试、听性脑干反应、耳蜗电图、畸变产物耳声发射、CT和 (或 ) MRI资料。结果 :本组病例具有下列矛盾现象 :主诉进行性听力减退 ,尤其听不清语言 ;纯音听阈呈上升型听力图 ;听性脑干反应引不出或明显异常 ,其改变比 40 0 0 Hz纯音听阈及短声主观阈严重 ;镫骨肌反射引不出 ;畸变产物耳声发射多正常 ,平均低频幅值较正常组略高 ,高频幅值较正常组稍低 ;桥小脑角影像学检查未见异常。结论 :对以听神经病、 型神经元病和中枢性低频感音神经性听力减退 3种命名及病损部位进行分析 ,初步倾向于病变主要在低位脑干 ,也有部分病例病损可能在螺旋神经节
Objective: To investigate the naming, clinical features and lesion sites of a group of hearing loss, which are mainly verbal hearing loss. Methods: The clinical symptoms, pure tone audiometry, acoustic impedance test, auditory brainstem response, cochlear electrogram, distortion product otoacoustic emissions, CT and ultrasound were analyzed in 11 patients with sensorineural hearing loss, (Or) MRI data. Results: This group of patients had the following contradictions: the main complaint of progressive hearing loss, in particular, can not understand the language; pure tone threshold showed a rising audiogram; auditory brainstem response was not cited or obvious abnormalities, the change than 40 0 0 Hz pure tone Auditory threshold and short-sighted subjective threshold severe; stapedius reflex can not lead; distortion product otoacoustic emission more than normal, the average low-frequency amplitude slightly higher than the normal group, high-frequency amplitude slightly lower than the normal group; cerebellopontine angle imaging studies No abnormalities. CONCLUSIONS: The three naming and lesion sites of auditory neuropathy, neuronal disease and central low frequency sensorineural hearing loss were analyzed. The initial predisposition to lesion was mainly in the low brain stem. In some cases, the lesion may be in the spiral nerve Festival