KBB-Forum 2022 , Cilt 21, Sayı 2

EVALUATION OF THE EFFERENT SYSTEM WITH CONTRALATERAL SUPPRESSION IN AUDITORY NEUROPATHY SPECTRUM DISORDER

Dr. Mürteza AKTAŞ1,2, Dr. Serpil Mungan DURANKAYA1,3, Dr. Selhan GÜRKAN1,3, Dr. Günay KIRKIM1,3, Dr. Bülent ŞERBETÇİOĞLU1,4
1Dokuz Eylül Üniversitesi Hastanesi, KBB Anabilim Dalı, Odyoloji Ünitesi, İzmir, Türkiye
2Dokuz Eylül Üniversitesi, KBB Odyoloji, Sağlık Bilimleri Enstitüsü, İzmir, Türkiye
3Dokuz Eylül Üniversitesi, Odyometri Programı, Sağlık Hizmetleri Meslek Yüksek Okulu, İzmir, Türkiye
4 İstanbul Medipol Üniversitesi, Odyoloji Bölümü, Sağlık Bilimleri Fakültesi, İstanbul, Türkiye Objective: It was aimed to examine the effects of Auditory Neurophaty Spectrum Disorder (ANSD) on medial olivocochlear efferent system activity by using Transient Evoked Otoacoustic Emission (TEOAE) and Contralateral Suppression (CLS).

Material and Methods: TEOAEs were recorded in a total of 48 ears, divided into two groups. Twenty-four ears of the ANSD group (mean 51.2 months) and 24 ears of the control group (mean 55.9 months) were included in the study. TEOAE measuremens of both groups were recorded with (broadband noise, 60 dB SPL) and without noise in the contralateral ear.

Results: When the contraateral supression values were compared between the ANSD and control groups, statistically significant difference was observed. The values of the control group after CLS were statistically significantly lower than before. When the TEOAE signal-to-noise ratios (SNR) of the ANSD group before and after KLS were compared, no statistically significant difference was observed in the measured frequencies.

Conclusion: No significant suppression effect was found when CLS is performed to patients with ANSD. The absence of suppression in the ANSD grup may be due to the non-functionality of the efferent system as well as the loss of functionality of both afferent and efferent system. CLS can be considered as a test battery that may be used in the diagnosis of auditory neuropathy. However, there is need further research on its use in the diagnosis for auditory neuropathy. Keywords : ANSD, Auditory Neuropathy, Contralateral Suppression, otoacoustic emission, MOC Efferent system