1989 Volume 32 Issue 6 Pages 746-754
Auditory evoked responses (ABR, MLR, SVR) were studied in infants with hydrocephalus who underwent shunt operation.
The subjects in this study were 28 infants aged 2 month to 8 years old.
Abnormality of ABR was recognized in 5 cases of congenital severe hydrocephalus and one case of postmeningitic hydrocephalus.
All cases of Chiari malformation type II showed normal ABR, although CT scan showed abnormality of brainstem.
Abnormalities of MLR or SVR with normal ABR were observed in 37% of the cases.
61% of the cases revealed abnormality of MLR or SVR.
The modalities of auditory evoked responses in infants with hydrocephalus lead us to the following two conclusions.
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.
Second, the central auditory pathway rostral to the brainstem seems to ho influenced in most cases of hydrocephalus.