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KMID : 0858620020060010050
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Korean Journal of Audiology
2002 Volume.6 No. 1 p.50 ~ p.55
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The Latency and Amplitude of Distortion Product Otoacoustic Emissions in Patients with Sensorineural Hearing Losses
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Cho In-Chang
Lee Jung-Hak
Kim Yong-Bok
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Abstract
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Objective: Distortion product otoacoustic emissions (DPOAEs) provide frequency-specific information concerning the status of the outer hair cell in the inner ear. The aim of this study was to investigate the changes of the latency and amplitude of DPOAEs in patients with sensorineural hearing losses (SNHLs) as a function of the primary level and frequency.
Design: DPOAE latencies and amplitudes were recorded at various primary frequencies and levels. The data were obtained from 28 ears of 18 adults (7 males, 11 females) with mild-to-moderate SNHLs.
Results: The number of ears which showed DPOAEs was greater for the high level of primary than for the middle or low level. For the high level of primary at high frequencies, DPOAEs were obtained at some ears with hearing thresholds of 50-60 dBHL. Generally, the DPOAE latency shortened and the absolute amplitude increased as the primary level increased; however, the relative amplitude remained without significant changes.
Conclusions: These results suggest that DPOAEs be efficient for the estimation of SNHLs at high frequencies with high levels of primaries. More data should be collected, however, for more accurate estimation of hearing thresholds.
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KEYWORD
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DPOAE latency, DPOAE amplitude, SNHL
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