听力正常人畸变产物耳声发射的基本特征及频谱变化过程分析

The Basic Properties and Spectral History of Distortion - product Otoacoustic Emissions in Young Subjects With Normal Hearing

为研究DPOAE尤其是DPOAE频谱变化过程的基本特征,根据0.125—8kH_z倍频纯音听阈和鼓室导抗图选择听力正常年轻人19例38耳进行DPOAE的测试.测试的内容包括DP-图、I/O曲线、潜伏期和DPOAE频谱变化过程.结果:DPOAE在正常人均能检出,幅值有明显的个体差异性,DP-图呈双峰伏,峰值分别为9.11±5.28dB SPL和7.72±6.85 dB SPL,位于1.5、6kHz处;3kHz处最小,为5.56±5.84dB SPL,DPOAE幅值随刺激强度的升高而升高,检出阈和潜伏期随频率的升高分别降低和缩短;多数人频谱变化过程曲线平坦,变异系数为253±1.89%,部分耳(7耳)变化过程曲线异常波动,占18.5%;提示频谱变化过程分析可能有反映耳蜗功能的亚临床病变的意义.

To study the basic properties of DPOAE including the Spectral History of DPOAE in subjects with normal hearing, Thresholds of octave pure tone from 0.125 to 8 kHz and Tympanometry in 226 Hz were measured to exclude the abnormal function of middle ear in 38 ears of 19 young subjects, then the spectrum of DPOAE、DP - Gram、I/O function curve、Latency and Spectral History of DPOAE were recorded. DPOAE can be detected in all subjects, the amplitude of DPOAE has great intersubjectal variety, the largest two values are 9.11 dB SPL at 1. 5 kHz and 7.72 dB SPL at 6 kHz, DP - Gram has two peaks. The amplitude increased with the increasement of primary tone level, The latency shortened with the increasement of primary frequency. The Spectral History in most of them is flat, the coefficiency of variance is 2. 53±1. 89% , the abnormal rate is 18.5% implying the Spectral History maybe have role in predicating subclinic cochlear lesion.