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Ⅰ.緒言
1950年代の半ばに脳波加算法が開発され,これによつて音響性誘発反応は容易に検出できるようになつた。そしてこの方法は,他覚的聴力検査,とくに幼小児の他覚的聴力検査に応用されうるものであると期待された。しかし,10数年を経過した現在その普及度はなお不十分なものである。その原因の一つとして,幼小児の脳波聴力検査は全身麻酔下に行なわなければならないということがあげられる。
脳波聴力検査における麻酔に伴う不利益な点を列挙すると次のようになるであろう。
The clinical application of gamma-hydroxy-butylic acid (GHBA) for EEG audiometry was investigated in 27 children.
The EEG pattern of GHBA-induced sleep was characterized by being light and/or moderate in effect with only few spindles and K-complexes. The depth of sleep changed to a lighter one when the subject was stimulated by tapping or calling. No significant side-effect was noted during or after sleep if a proper dosage of atropine sulfate was administered along with GH BA. Sixty clear responses to the stimuli of 35 dB (SL) click were obtained in 15 out of the 19 normal youngsters tested. These tests when compared to those taken at the awakened stage showed a larger value of P2 and N2 that made them much easier to be recognized.
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