Abstract
Input/output (I/O) curves of evoked otoacoustic emissions (EOAEs) reveal a saturation at 30 dB or thereabout above their detection threshold. It has been suggested that such I/O relation corresponds to that of the basilar membrane vibration related with an active electro-mechanical process of outer hair cells. EOAEs in response to 1–2 kHz short tone bursts were measured. EOAEs were examined in ears with idiopathic sudden hearing loss (HL), low tone type acute sensorineural HL, Ménière's disease and noise-induced HL. Three types of shift that were downward, horizontal and combined were observed in their I/O curves. The downward shift was seen mainly in the ears with high tone HL and the horizontal shift was in the ears with low tone HL. Three types of shift were observed in the ears of Ménière's disease, in which glycerol administration augmented EOAE amplitude beyond the normal saturation level of its cotralateral side. Measurements of EOAE I/O curves are useful for diagnosis of inner ear impairments related to outer hair cell dysfunction in ears with sensorineural HL.
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