The Analysis of Auditory Brainstem Response Latency for Normal Hearing Newborn and Infants / 听力学及言语疾病杂志

ABSTRACT

Objective To investigate the characteristic changes of the auditory brainstem response (ABR) of normal hearing newborn and infants .Methods One hundred and forty -five cases (290 ears) normal hearing new-born and infants were enrolled for ABR test .Before that they passed the distortion product otoacoustic emissions and acoustic immitance test previously .According to age ,13 (26 ears) of 145 were included in the 1~7 days age group ,17 (34 ears) was in the 30~59 days age group ,20 (40 ears) in the 2~4 months age group ,19 (38 ears) in the 5~7 months age group ,17 (34 ears) in the 8~10 months age group ,18 (36 ears) in the 11~13 months age group ,12 (24 ears) in the 14~16 months age group ,13 (26 ears) in the 17~19 months age group ,16 (32 ears) in the more than 20~24 months age group .The control group was 20 (40 ears) normal hearing young persons (18~25 years old) .The variation of the peak latency and interpeak latency of waves were observed ,and compared with the normal young people .Results In 70 dB nHL click sound stimulus ,the peak latency and interpeak latency ofⅠ ,Ⅲ ,Ⅴ waves of normal hearing neonates and infants progressively shortened as they grew older .As they ap-proach 18 months or more old age ,their peak latency and interpeak latency of Ⅰ ,Ⅲ ,Ⅴ waves may be same as nor-mal young people .Conclusion With the growth of the age ,the peak latency and interpeak latency of Ⅰ ,Ⅲ ,Ⅴwaves of normal hearing newborn and infants gradually shortened .The reason may be related to the maturity of the auditory system .