新生児集中治療施設における早産児のABR

概要

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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 the latencies and the conceptional age showed a linear relationship, which was roughly indicated by the following formula; "the latency of 1 wave"="conceptional age" X (-0.07)+4.13.Delay of wave 1 peak were found in the cases of acute otitis media and Treacher Collins syndrome.Absence of wave 1 peak were found in the cases of congenital rubella syndrome and kernicterus.The measurement wave 1 latency, which was elicited by intense tone such as used in the present study, seemed to be useful to distinguish cochlear deafness from conductive deafness.