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Comparitive study in detection of severe hearing loss in developmentally retarded children using brainstem-evoked response audiometry and conventional audiometry

Author: 
Dr. Dalia Biswas and Dr. Prakash, A. Nikose
Subject Area: 
Health Sciences
Abstract: 

Background: This study was taken up to compare the hearing threshold in developmentally retarded children with severe hearing loss using conventional audiometry and brain stem evoked response audiometry. Method: It was a Cross sectional, comparative study involving 20 developmentally retarded children in the age group of 6-12 yrs of age. Sample size was 20. Using BERA the hearing threshold in decibles (dB) of each ear was found seperately (Based on appearance of wave V at minimum stimulus intensity). Pure Tone Audiometry was used to measure hearing acuity over a range of frequencies (500 – 6000 Hz). The results were plotted on an audiogram, which displayed the auditory threshold at each frequency for each ear. Result: The comparision report between BERA and PTA showed that 55% of cases had an agreement between the two (BERA and PTA) findings. 30 % showed no agreement between the 2 testing methods (BERA and PTA). In 15% of the cases estimation of hearing threshold could be made only by BERA test. Out of this 15% cases, 5% cases showed inconclusive PTA and the rest (10%) showed no response by PTA. The comparative finding of hearing threshold using Mann Whitney U Test as regards to PTA and BERA was found to be significant. Conclusion: This indicates that BERA can provide a more conclusive information as compared to PTA regarding hearing threshold in severely deaf developmentally retarded children.

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