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CC BY-NC-ND 4.0 · Int Arch Otorhinolaryngol 2022; 26(02): e250-e259
DOI: 10.1055/s-0041-1733928
Original Article

Reliability of Contralateral Suppression in Evoked Distortion Product Otoacoustic Emissions

Ana Carolina dos Santos 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
,
Ludimila Labanca 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
,
Larissa Resende Assumpção 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
,
Patricia Cotta Mancini 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
,
Sirley Alves da Silva Carvalho 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
,
Luciana Macedo de Resende 
1   Department of Speech-Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
› Author Affiliations Funding Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant/Award Number: 309144/2018) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES – Grant/Award Number: 001).
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Abstract

Introduction Distortion product otoacoustic emissions (DPOAE) and their suppression may be considered useful in monitoring cochlear function and the efferent auditory pathway inhibitory effect. Nonetheless, the establishment of reliable parameters of response variations is of great importance.

Objectives To verify the replicability of test and retest in the research of the inhibitory effect of the efferent pathway using contralateral suppressing stimulus during DPOAE recording for clinical applicability.

Methods Cross-sectional study with 48 volunteers, aged 18 to 30 years, with normal audiometric thresholds. The procedures included were audiometric and immittance measures to overrule any conductive or sensorineural conditions and DPOAE recordings without and with contralateral suppression with a 60 dBHL white noise. Distortion product otoacoustic emissions amplitudes were analyzed and compared in both conditions with Wilcoxon test, and the Spearman correlation test was used to assess test-retest reliability.

Results The comparative analysis showed differences between amplitudes in test and retest conditions only in 1,500 Hz for DPOAE measures with all other tested frequencies showing no differences, and no difference was observed in all recorded frequencies in the test and retest comparison for DPOAE suppression. The degree of correlation between test and retest of DPOAE amplitude was good at 6,000 Hz and strong (r > 0.880) at the other frequencies. For DPOAE with suppression, all frequencies presented strong correlation between test and retest: 1,500 Hz (r = 0.880), 2,000 Hz (r = 0.882), 3,000 Hz (r = 0.940), and 6,000 Hz (r = 0.957).

Conclusions The study found good replicability in contralateral suppression of DPOAE with potential clinical applicability, and we recommend conducting the test from 2000Hz to higher frequencies for more reliable results.

Keywords

cochlear hair cells - auditory efferent pathway - reproducibility of results - hearing loss - young adult - noise effects


Publication History

Received: 07 October 2020

Accepted: 07 April 2021

Article published online:
30 August 2021

© 2021. Fundação Otorrinolaringologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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