Abstract
Auditory brain stem responses were recorded in 114 ears of 63 high risk infants in NICU. The responses were evoked by 4kHz logon in 90dB.The mean values and standard deviations of wave 1 latencies were calculated in every con-ceptional age. The mean values of latencies and conceptional showed a linear relationship, which was roughly indicated by following formula; the latency of 1 wave=conceptional age X (-0.07)+4.13.Delay of wave 1 peak were found in cases of acute otitis media and Treacher Collins syndrome.Absence of wave 1 peak were found in cases of congenital rubella syndrome and kernicterus.The measurement wave 1 latency, which was elicited by intense tone such as used in present study, seemed to be useful to distinguish cochlear deafness from conductive deafness.
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