瞬态诱发耳声发射频域分析的临床意义

目的：确定瞬态诱发耳声发射（ＴＥＯＡＥ）频域分析的应用价值。方法：对正常耳,噪声暴露耳,梅尼埃病耳,中耳病变耳及对侧抑制耳,进行ＴＥＯＡＥ频域测试。结果（１）噪声暴露耳,一些频率带的频信噪比降低,主频出现移动变化;（２）梅尼埃病一些甘油摄入后,频带信噪比增高,未引出ＴＥＯＡＥ的部分耳出现ＴＥＯＡＥ,主频也有移动变化;（３）中耳病变耳,不同的鼓室病变耳的频带信噪比降低,程度各异,其变化与声导纳改变有

The clinical significance of analysis of frequency domain of transient-evoked otoacoustic emissions

OBJECTIVE: To determine the clinical value of analysis of frequency domain of transient-evoked otoacoustic emissions (TEOAE). METHOD: Frequency domain of TEOAE were measured in 1. normal functional ears; 2. noise exposure ears; 3. Meniere's ears; 4. pathologic ears of media ear; 5. contralateral suppression of normal ears. RESULT: 1. After exposure to noise, the value of band signal/noise ratio were decreased in certain frequency band, main frequency of FFT response were changed in frequency spectrum. 2. In the ears of Meniere's disease, after the administration of glycerol, the value of band signal/noise ratio were increased in certain frequency band, no TEOAE were elicited before the administration of glycerol, but they appeared after glycerol administration in some ears, main frequency were changed in frequency spectrum, 3. In the pathologic ears of media ears. The value of band signal/noise ratio decreased to different extent with different kind of pathologic changes, which is related to the change of acoustic immittance. Besides. Acoustic immittance were normal in those with mild pathologic change in the tympanic membrane. The value were decreased in band signal/noise ratio. 4. After contralateral suppression of normal ears, 1 kHz and 2 kHz band signal/noise ratio value were decreased. CONCLUSION: Frequency domain of TEOAE is a sensitive parameter and has property of frequency specificity. It is of great help to study the function of outer hair cells farther and make a differential diagnose in the clinical practice.