小児水頭症における聴性誘発反応（ＡＢＲ，ＭＬＲ，ＳＶＲ）の検討

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  • Auditory evoked responses (ABR, MLR, SVR) in hydrocephlus.

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Auditory evoked responses (ABR, MLR, SVR) were studied in infants with hydrocephalus who underwent shunt operation.<br>The subjects in this study were 28 infants aged 2 month to 8 years old.<br>Abnormality of ABR was recognized in 5 cases of congenital severe hydrocephalus and one case of postmeningitic hydrocephalus.<br>All cases of Chiari malformation type II showed normal ABR, although CT scan showed abnormality of brainstem.<br>Abnormalities of MLR or SVR with normal ABR were observed in 37% of the cases.<br>61% of the cases revealed abnormality of MLR or SVR.<br>The modalities of auditory evoked responses in infants with hydrocephalus lead us to the following two conclusions.<br>First, these ABR findings suggested that the influence upon the auditory pathway at the level of brainstem was different between congenital severe hydrocephalus and Chiari malformation type II.<br>Second, the central auditory pathway rostral to the brainstem seems to ho influenced in most cases of hydrocephalus.

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