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Mechanisms in noise-induced permanent hearing loss: an evoked otoacoustic emission and auditory brainstem response study

Published online by Cambridge University Press:  29 June 2007

Zheng-Min Xu ,
Bart Vinck ,
Eddy De Vel  and
Paul van Cauwenberge
Zheng-Min Xu*
Affiliation:
Department of Otolaryngology, University Hospital Ghent, Ghent, Belgium.
Bart Vinck
Affiliation:
Department of Otolaryngology, University Hospital Ghent, Ghent, Belgium.
Eddy De Vel
Affiliation:
Department of Otolaryngology, University Hospital Ghent, Ghent, Belgium.
Paul van Cauwenberge
Affiliation:
Department of Otolaryngology, University Hospital Ghent, Ghent, Belgium.
*
Address for correspondence: Zheng-Min Xu, M.D., Ph.D., Department of Otolaryngology, University Hospital Ghent, De Pintelaan 185 B–9000 Ghent, Belgium.
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Abstract

In this study 22 patients (44 ears) with noise-induced permanent hearing loss were audiologically evaluated using transient-evoked otoacoustic emissions (TEOAE) and auditory brain-stem response (ABR). Twenty-one normal subjects (42 ears) without exposure to occupational noise were used as controls. Based upon the hearing loss at 4, 3, 2 and 1 kHz on the pure-tone audiogram, they were classified into four groups. In group 1 (eight ears), emissions were present in all ears but their TEOAE-noise level and their reproducibility (percentage) proved to be weak. The auditory brain-stem response (ABR) indicated that the I/V amplitude ratio, the latency values of wave V and the I–V intervals fell within the normal range in all ears. In Group 2 (14 ears), 40 per cent had no emissions, whereas the remaining ears showed weak emissions. The ABR revealed that in all ears the I/V amplitude ratio became small while wave V peak latency as well as I–V intervals were within the normal range. In Group 3 (10 ears), emissions were absent in 50 per cent, while in the other ears the emissions were very weak. The ABR revealed that the I/V amplitude ratio, which could be calculated in the 60 per cent in which wave I was present, was smaller than in Group 2. Wave V latency as well as I–V intervals were within the normal range. In Group 4 (12 ears), none of the ears showed emissions. The ABR indicated that the I/V amplitude ratio was much smaller when wave I was present (27 per cent) as well as I–V interval values being within the normal range. Wave V absolute latency value (δV index) indicated a positive index in 17 per cent of this group (two ears) when wave I was absent. In the present study a dynamic process from cochlear outer hair cells to cochlear neurons was seen, correlating with an increasing hearing loss.

Keywords

Hearing loss, noise inducedAudiometry, evoked responseAcoustic emissions
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 112 , Issue 12 , December 1998 , pp. 1154 - 1161
Copyright
Copyright © JLO (1984) Limited 1998

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