胎内音刺激による新生児聴性反応の記録

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  • An Automated Recording System of Auditory Response to the Intra-Uterine Sound for Screening of the Neonates.

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Intra-Uterine Sound (IUS) has been known to have an effect to soothe crying neonates. This effect has already been adopted for auditory screening of the newborns. We developed a new equipment which automatically records the response of the neonates.<br>When the baby begins to cry, the equipment provides IUS and records his or her movement. If amplitude of the movement is markedly reduced, it is considered as responded.<br>Forty-seven healthy newborns and 11 neonates with some perinatal disorders were examined. Each baby was tested for 12 hours and then recording was continued for another 12 hours without IUS. Among 47 healthy babies overall response rate to the IUS was 46.3% and pseudo response (spontaneous cessation of crying) rate was 24.2%. Ratio of the response rate to the pseudo-response rate was calculated for each subject. Forty-six among 47 showed the ratio greater than 1.0. A ratio of 1.6 was presumed to be an appropriate indicator for auditory screening.<br>Among 11 babies with perinatal disorders 7 showed the ratio less than 1.6. These 7 babies were evaluated to have normal hearing by the follow-up study and they were considered to have been inadequately developed to continue crying.<br>Developmental stage and general condition of each subject must be taken in account for the evaluation of this screening test.

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