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Mean serum fentanyl concentrations ± SD (ng/mL) in pigs treated with a fentanyl patch with (treatment A/F) and without isoflurane anaesthesia (treatment F). Values obtained 1, 6, 12, 24, 48 and 72 hours after the patch application are shown. The fentanyl plasters were taken off 60 hours after application. (n = 8)
