Determining the effect of intraperitoneal pethidine on postoperative pain.

The main problem in the postoperative period is pain relief. Adequate postoperative analgesia not only leads to patient's comfort but also decreases morbidity, nursing care and time of hospitalization. Determination of the effect of intraperitoneal pethidine on postoperative pain in women scheduled for elective tubal ligation was undertaken. In a double blind clinical trial study of 60 women, ASA I, 25-45 years old, were enrolled for elective tubal ligation in Kosar hospital in Qazvin, IRAN. Patients were randomly divided in two equal groups (30 each).One group received pethidine intraperitoneally and the other group received equal amount of placebo in the same region. The intensity of postoperative pain was evaluated by visual analogue scale (VAS) for about 8 hours. Incidence of nausea was also evaluated. Data was transformed to SPSS software. Then data analysis was performed by U-test. There was no significant statistical difference with regard to age, weight, and time of operation between the two groups. The mean score of pain was significantly lower in intraperitoneal pethidine group than placebo group but the incidence of nausea in the intraperitoneal pethidine group was more than in placebo group (P < 0.05). Thus, intraperitoneal pethidine decreases postoperative pain but increases postoperative nausea.