The effect of continuous preperitoneal infusion of ropivacaine as postoperative analgesia in patients undergoing major abdominopelvic surgeries for resection of tumours

Interventions: The patients will be divided into two groups .The first groups will receive continuous epidural infusion for analgesia and the second groups will receive continuous preperitoneal infusion for analgesia. The intervention group is the preperitoneal group in which a multiholed catheter will be placed by surgeon in the preperitoneal space at the end of surgery giving ropivacaine 0.5% 5ml/h by continuous infusion for 48 hours postoperative after giving bolus dose of 15 ml of lidocaine 2%
Primary outcome(s): postoperative pain as measured by visual analogue score
[immediate after surgery,1h,2h,4h,6h,8h,12h,18h,and24h,48h,and lastly 72h];total analgesic consumption assessed by patients medical charts[after 48 hours]
Study Design: Purpose: Treatment; Allocation: Randomised controlled trial