Risk Faktörü Olan ve Olmayan Yenidoğanlarda Akustik Stapedial Refleks Testi Bulguları

Abstract

An acoustic stapedial reflex (ASR) is a contraction of the stapedius muscle in response to an intense acoustic signal. The goal of this study is to obtain normative data of ASR, to determine presence rate of ASR, to invatigate effect of parameters of acoustic immitancemetry on presence of ASR, and to assess test-retest reliability of ASR at 1000 Hz probe tone in neonates with and without risk factor. Both control and reseach group were administered screening Transient Evoked Otoacoustic Emission (TEOAE), Automated Auditory Brainstem Response (AABR), tympanometry and ASR after birth and 1 month later. According to our study; in terms of ASR thresholds therr is no significant diffrence between two groups. We found in two groups, ipsilateral ASR thresholds were higher than contralateral ASR and BBN reflex thresholds were less than tonal stimulus. Presences of ipsilateral ASR were higher than presence of contralateral ASR. At first assesment, there was a significant effect of Equivalent Ear Canal Volume (Vea) on only presence of reflexes in research group at ipsilateral 500 and 2000 Hz, in control group at contralateral 2000 and 4000 Hz. In second assessment there was a significant effect of Tympanometric Peak Pressure (TPP) on only presence of reflexes ipsilateral 2000 Hz in research group. Test-retest reliability of ASR test was found high. We assert that the use of ASR test at 1000 Hz probe tone in neoanates can increase presence of ASR. ASR is a important diagnostic test battery in neonate because it gives us more information about their all hearing system. We need future study about this subject.