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The aim of this study was to confirm whether intravenous anaesthesia supplemented with the N-methyl-d-aspartate (NMDA) antagonist ketamine could reduce post-operative pain after elective open cholecystectomy. Fifty patients were randomised double-blind to one of the following two groups: PF Group received propofol and fentanyl supplemented with saline infusion; PFK Group received propofol and fentanyl...