British Journal of Anaesthesia, Vol 80, Issue 3 365-370, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
T. Shichino, M. Murakawa, T. Adachi, T. Arai, Y. Miyazaki and K. Mori
By analysing the EEG, reticular multi-unit activity and behavioural
changes, we have classified general anaesthetics into three groups: central
nervous system (CNS) depressant, CNS excitant and epileptogenic agents.
Changes in CNS neural activity are associated with alteration in
transmitter release. We have attempted to clarify the actions of widely
used inhalation anaesthetics, such as isoflurane (CNS depressant), nitrous
oxide (CNS excitant) and sevoflurane (epileptogenic) on acetylcholine (ACh)
release in the cerebral cortex using brain microdialysis. ACh release was
suppressed by isoflurane and sevoflurane in a dose-related manner but
recovered on wash-out. There were no significant differences between the
effects of sevoflurane and isoflurane at the same MAC values. In contrast,
ACh release was enhanced significantly by nitrous oxide. These findings
indicate that the response of the cortical cholinergic cells to different
anaesthetics reflects their neurophysiological characteristics, that is
whether they stimulate or suppress CNS neurones.
LABORATORY INVESTIGATIONS
Effects of inhalation anaesthetics on the release of acetylcholine in the rat cerebral cortex in vivo
Department of Anaesthesia, Kyoto University Hospital, 54 Shogoin-Kawara-cho, Sakyo-ku, Kyoto 606-01, Japan
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