畸变产物耳声发射临床应用价值的探讨

研究了７３例（１３９耳）纯音听阈正常耳及各种感音神经性聋耳的ＤＰＯＡＥ，发现ＤＰＯＡＥ对耳蜗功能异常的改变早于纯音测听，并可精确地反映耳蜗毛细胞在相关频率上的功能状态；ＤＰＯＡＥ幅值及引出率随纯音听阈的提高而下降，当纯音听阈＞５０ｄＢ（ＨＬ）时，ＤＰＯＡＥ幅值明显降低或缺失；蜗后病变耳ＤＰＯＡＥ正常，当蜗后病变累及耳蜗时，ＤＰＯＡＥ幅值可异常，其异常程度与纯音听阈不平行。认为ＤＰＯＡＥ有广泛临床应用价值。

Research on Clinical Application Value of Distortion Product Otoacoustic Emission

In this paper,we studied distortion product otoacoustic emission gram(DPOAE gram) in 73 cases(139 ears) of pure tone hearing threshold normal and sensorineural hearing loss subject.Results indicated that changes of DPOAE gram was earlier than pure tone audiometric gram for abnormal cochlear function,and DPOAE could respond the function state of hair cells at different frequencies.The amplitude and incidence of DPOAE were reduced as the pure tone hearing threshold were raised,when pure tone hearing threshold was greater than 50 dB HL,DPOAE decreased dramaticaly or was even absent.DPOAE was normal if the damage was in retrocochlear.However,when the damage reached to cochlear,the amplitudes of DPOAE could be abnormal which did not correspond to the level of pure tone threshold.It's concluded that DPOAE can be used extensively as a tool to detect hearing loss.