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EFFECTS OF THIOPENTAL ON SENSORY EVOKED POTENTIALS IN CAT Mikio Takaya 1 , Kouzo Moritake 1 , Tsuneki Konishi 1 , Hideyuki Suwa 1 , Hajime Handa 1 1Department of Neurosurgery, Kyoto University Medical School pp.579-584
Published Date 1986/6/1
DOI https://doi.org/10.11477/mf.1406205726
  • Abstract
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Noninvasive electrophysiological evaluation with sensory evoked potentials would be of clear diag-nostic and prognostic value in evaluating coma-tose patients with stroke or severe head injury.

In order to protect the brain from such kinds of insults, barbiturate coma therapy has been em-ployed and its effectiveness has been already esta-blished. However, in the barbiturate coma therapy, it is occasionally difficult to distinguish the phar-macological effect of barbiturate from the preexist-ing brain dysfunction caused by the underlying process of the disease.

In adult cats, authors studied changes of sensory evoked potentials following cumulative intravenous administration of thiopental which is used cli-nically for barbiturate coma therapy. P1 and N1 of cortical SEP showed tendency of gradual de-crease in amplitude. However, no significant chan-ges occurred in latency by stepwise increment of thiopental dose. Changes in amplitude of P1 and N1 of cortical SEP preceded to the flattening on electroencephalogram. Around at the level of the concentration where EEG changes began, I-II interpeak latency of BAEP and latency of wave I of short latency SEP started to increase. BAEP and early components of SEP (I・II・III・IV) per-sisted even in by far the higher level of serum concentration of thiopental than that of clinical use. Furthermore, most of these parameters showed no statistically significant change neither in ampli-tude nor in latency.

These experimental results suggest that sensory evoked potentials will provide us with useful in-formation in the assessment of the brainstem function in patients under thiopental induced deep coma.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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