In this study, we evaluated the effect of subanaesthetic concentrations of S-ketamine and sevoflurane on auditory, visceral and contact heat evoked potentials (AEP, VPEP and CHEP). VPEP and CHEP were measured to quantify the analgesic effect of these drugs, and AEP to analyze the sedative component. From January to April 2007, 30 volunteers were randomly assigned to receive either ketamine or sevoflurane at 4 different drug concentrations. At each concentration level, evoked potentials were recorded. VPEP and CHEP show a decrease of amplitudes under S-ketamine and sevoflurane. Dose-related decrease of amplitudes of VPEP and CHEP suggest antinociceptive effects of both drugs. This is in contrast to the hypothesis that volatile anaesthetics may only have minor analgesic effects. Unspecific effects on evoked potential amplitudes seem unlikely, because AEP are not equally affected.
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In this study, we evaluated the effect of subanaesthetic concentrations of S-ketamine and sevoflurane on auditory, visceral and contact heat evoked potentials (AEP, VPEP and CHEP). VPEP and CHEP were measured to quantify the analgesic effect of these drugs, and AEP to analyze the sedative component. From January to April 2007, 30 volunteers were randomly assigned to receive either ketamine or sevoflurane at 4 different drug concentrations. At each concentration level, evoked potentials were reco...
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