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• W1964079642 abstract "It is unclear whether general anesthetics induce enhancement of neural inhibition and/or attenuation of neural excitation.We studied the effects of pentobarbital (5 x 10-4 mol/L), propofol (5 x 10-4 mol/L), ketamine (10-3 mol/L), halothane (1.5 vol%), and isoflurane (2.0 vol%) on both excitatory and inhibitory synaptic transmission in rat hippocampal slices. Excitatory or inhibitory synaptic pathways were isolated using pharmacological antagonists. Extracellular micro-electrodes were used to record electrically evoked CA1 neural population spikes (PSs). In the presence of the gamma-aminobutyric acid type A (GABAA) receptor antagonist (bicuculline), the inhibitory actions of pentobarbital and propofol were completely antagonized, whereas those of ketamine, halothane, and isoflurane were only partially blocked. To induce the N-methyl-D-aspartate (NMDA) receptor-mediated PS (NMDA PS), the non-NMDA and GABAA receptors were blocked in the absence of Mg2+. Ketamine, halothane, and isoflurane decreased the NMDA PS, and pentobarbital and propofol had no effect on the NMDA PS. The non-NMDA receptor-mediated PS (non-NMDA PS) was examined using the antagonists for the NMDA and GABAA receptors. Volatile, but not IV, anesthetics reduced the non-NMDA PS. These findings indicate that pentobarbital and propofol produce inhibitory actions due to enhancement in the GABAA receptor; that ketamine reduces NMDA receptor-mediated responses and enhances GABAA receptor-mediated responses; and that halothane and isoflurane modulate GABAA, NMDA, and non-NMDA receptor-mediated synaptic transmission. Implications: Volatile anesthetics modulate both excitatory and inhibitory synaptic transmission of in vitro rat hippocampal pathways, whereas IV anesthetics produce more specific actions on inhibitory synaptic events. These results provide further support the idea that general anesthetics produce drug-specific and distinctive effects on different pathways in the central nervous system. (Anesth Analg 1999;88:676-80)" @default.
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• W1964079642 date "1999-03-01" @default.
• W1964079642 modified "2023-10-17" @default.
• W1964079642 title "The Effects of General Anesthetics on Excitatory and Inhibitory Synaptic Transmission in Area CA1 of the Rat Hippocampus In Vitro" @default.
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• W1964079642 doi "https://doi.org/10.1097/00000539-199903000-00039" @default.
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