Some normal Results of Brainstem Evoked Response / Шинэ санаа Шинэ нээлт

ABSTRACT

Brainstem Evoked Response Audiometry test is a method to diagnose and differentiate the type, degree and the location of cochlear and retroocochlear hearing loss for infants early. Test methods to determine cochlear and retroocochlear hearing loss was introduced relatively late in the clinical practice of our country. Even though, we started to conduct BERA tests since 2007, there hasn’t beenany research conducted for determining the normal results for children aged 0-5. Aim: The study aims to determine some average Results of BERA tests for Mongolian children aged 0-5 with normal hearing by age groups using Octavus-BERA apparatus.The research has been conducted using cross sectional method of analytic research from 2009-2013.For the study, 110 children from children aged 0-5 who were diagnosed to have normal hearing from audiological department of Otorhinolaryngological hospital and 16 children with sensorineural (cochlear) hearing loss have been selected randomly. When the latency of waves for children aged 0-5 with normal hearing were measured and the average results for 70 dB were obtained in the BERA test: wave I was identified to be 1.64±0.15 – 2.08±0.5msec. Wave III was 3.68±0.18 - 4.47±0.73 msec, Wave V was 5.37±0.23 - 6.76±0.65 sec. When the latency between waves were measured and the average results were obtained in the BERA test: Between waves I-III, it was 2.05±0.20 – 2.39±0.53 msec. Between waves III-V was 1.69±0.10 -2.34±0.70 msec and between waves I-V was 3.70±0.29 - 4.65±0.56 msec. The latency of wave I for children with sensorineural hearing loss was 2.32±0.76 msec, 4.62±0.59msec for wave III and 6.55±0.65 msec for wave V, which was elongated with a statistical probability (p=0.00-0.05). Latency between waves was 2.39±0.45 msec between wave I-III, 1.83±0.16 msec between waves III-V and 3.97±0.88 msec between waves I-V, which doesn’t have statistically significant difference from the normal results.As the children’s age increases, the latency of the waves will shorten and becomes relatively stable from 25-30 months which is similar to adults. While the latency between waves I-III had no difference with statistical probability for children with all ages, latencies for waves III-V and I-V shortens as children’s age increases.Latency for children with sensorineural hearing loss was elongated with statistical probability (p0.05). This Result has critical importance in diagnosing cochlear deafness.