Patients for open gynecologic surgery will all receive both an epidural catheter and bilateral transversus abdominis plane (:TAP) catheters. After randomization in to two groups the patients receive either 1) intermittent boluses of ropivacaine in the TAP-catheters and isotonic potassium chloride-infusion i the epidural catheters or 2) intermittent isotonic potassium chloride-boluses i the TAP-catheters and bupivacain-infusion in the epidural catheters.~The investigators record pain-score and consumption of opioids in the first 24 hours postoperatively as well as thermoanalgesia at dermatome-levels th10-th12.~The investigators assume that the effect on postoperative pain after open gynecologic surgery is equal in the two groups.
This study compares the effect on postoperative pain of bolus administration of ropivacaine in Transversus abdominis plane catheter and continuous bupivacain-infusion in epidural catheters following open gynecologic surgery.The study is double blind. The hypothesis is that the effect of the two modes of pain treatment are equal.