The aim of this trial is to examine the possibility that fentanyl 1,5 Āµgr/kg given intravenously (i.v.) before the start of remifentanil infusion for anesthesia gives less development of tolerance/hyperalgesia postoperative than fentanyl given at the end of surgery (the traditional method).
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Less use of postoperative opioids
Less visual analog scale (VAS) and verbal rating scale (VRS) in the treatment group