正常出生児における生後1年間のABR : 音圧と潜時の関係の変化

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Auditory brainstem responses (ABR) evoked by monaurally delivered clicks were recorded in 192 ears of newborns and infants, 1 month, 3 months, 6 months and 12 months of age, in order to study the maturational changes of the latency of ABR components, especially the latency-intensity relationship during the first year of life. The results were as follows. 1) ABR were recorded in a ear at 3 days, 3 months, 6 months and 12 months after birth. The latency-shift with increasing of intensity from 35dB to 85dB nHL were 1.8 msec at 3 days, 1.3 msec at 3 months, 1.2 msec at 6 months and 1.1 msec at 12 months after birth. 2) ABR were recorded in 80 ears of newborns, 49 ears of a month, 27 ears of 3 months, 18 ears of 6 months and 17 ears of 12 months old infants. The latency-intensity data of each wave in each age-group could be fitted well by a linear regression line. The value of average slope of each wave in newborns was larger than that in a month old infants. The value of average slope decreased most during the first month and showed less change after then. The average latency-shift of wave I with increasing of intensity from 3dB to 85dB nHL were 1.59 msec in newborns, 1.43 msec in a month old, 1.38 msec in 3 months old, 1.32 msec in 6 months old and 1.26 msec in 12 months old infants. 3) The latency of wave I decreased most prominently during the first month after birth and showed less change after then. The interpeak-latency between wave I and wave III showed no change during the first 3 months, and decreased most between 3 months and 6 months of age. The interpeak-latency between wave III and wave V showed no change during the first 6 months and decreased most between 6 months and 12 months of age.
社団法人日本耳鼻咽喉科学会の論文

正常出生児における生後1年間のABR : 音圧と潜時の関係の変化

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