500Hz logon versus click ABR maturation.
OBJECTIVE
To provide age-equivalent norms for a 500Hz logon evoked ABR obtained in a group of children ranging 40 weeks-4 years old and compare these 500Hz tonal norms to age-equivalent norms for click-evoked ABR.


METHODS
Seventy-seven infants and children ranging from conceptional age of 40 weeks (term babies) to 4 years were tested with both click and tonal ABR without any risk factors for hearing loss.


RESULTS
Data analyses were consisted of 6 age groups. Mean wave V latencies were compared with the adult norms. Latencies were decreased by age in both click and tonal ABR recordings.


CONCLUSIONS
Five hundred Hertz of tonal ABR wave V latency did not mature until to 2-4 years old but, click ABR wave V latency reached maturity at the same age range.
Külekçi
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Department of Audiology, Marmara University Medical School, Istanbul, Turkey. sezer53@yahoo.com
Terlemez
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Ciprut
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Akdaş
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D001299:Audiometry / Q000295:instrumentation*; D002648:Child; D002675:Child, Preschool; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006311:Hearing Disorders / Q000453:epidemiology*; D006801:Humans; D007223:Infant; D008297:Male; D008403:Mass Screening / Q000295:instrumentation; D012016:Reference Values; D012720:Severity of Illness Index