Pain After Laparoscopy Results From the Incision, Manipulation of the Abdominal Organs, and Retained CO2(Back Pain)

Postoperative pain after laparoscopy may be localized pain resulting from incision due to many (two or three) punctures (somatic pain) or due to manipulation of the intra-abdominal organs as ovaries, uterus, omentum, and intestine (visceral pain) or shoulder and back pain caused by retained CO2 in the peritoneal cavity with its irritation effect on the diaphragm.Patients will be divided into two groups: Intraperitoneal (IP) group (20 patients):They will receive 100 ml normal saline infused over 10 min immediately before the induction of anesthesia and then continuous infusion of 500 ml normal saline intraoperatively then intraperitoneal wash of 100 ml normal saline containing 30 mg/kg MgSO4 at the end of laparoscopy. Intravenous (IV) group (20 patients):They will receive 100 ml normal saline containing MgSO4 30 mg/kg infused over 10 min immediately before the induction of anesthesia and then continuous infusion of 500 ml normal saline containing MgSO4 (8mg/kg) intraoperatively then intraperitoneal wash using 100 ml normal saline at the end of laparoscopy