An Overview of Electrically Evoked Otoacoustic Emissions in the Mammalian Cochlea

Alternating currents injected into the cochlea are able to evoke outer hair cell-mediated basilar membrane motion, thus give rise to production of otoacoustic emissions. This electrically evoked otoacoustic emission(EEOAE) provides a useful tool for the research of out hair cell electromotility in vivo. This article reviews the research work on EEOAEs in mammals. Features of the EEOAEs and theories of their generation are introduced. Methods of EEOAE measurement are also described.

水杨酸钠急性注射对清醒豚鼠畸变产物耳声发射的影响

目的研究急性注射水杨酸钠对清醒豚鼠畸变产物耳声发射(DPOAE)的影响及其特征,探讨其对外毛细胞(OHC)的毒性作用。方法采用CELESTA503型耳声发射分析仪在清醒豚鼠上记录DPOAE(包括DP听力图及DP输入输出函数曲线)来监测水杨酸钠对耳蜗及毛细胞功能的影响;急性水杨酸钠实验组及生理盐水对照组分别在注药前及注药后2、4、8h进行DPOAE测试;测试结果采用SPSS10.0统计软件进行分析。结果急性水杨酸钠注射主要引起DPOAE幅值和IO斜率分别可逆性下降和升高,注射后2h变化最大,8h基本恢复;某些频率或强度的DPOAE幅值、IO斜率在注药后与注药前结果有统计学差异(P<0.01或P<0.05),特别是8kHz。结论DPOAE幅值和IO斜率分别可逆性下降和升高表明OHC能动性下降,即耳蜗OHC功能改变为其耳毒性作用之一。