Objective: To compare the efficacy and side effects of patient-controlled intravenous morphine with epidural single bolus morphine in postoperative pain relief. Method: Sixty patients undergoing gynecological procedures under epidural anesthesia were randomly assigned to epidural morphine(EPI)group or patient-controlled intravenous analgesia (PCIA) group. In the EPI group,2 mg of morphine was injected into epidural space at the end of operation. In PCIA group, 1 mg of morphine as a demand dose would be injected intravenously by the patient through a patientcontrolled analgesic delivery system until the pain relieved. The patients were followed up at 4, 8, 12, 24 h after operation,and the degree of pain,sedation, nausea and vomiting were assessed. Result: The total dosage of morphine was higher in the PCIA group(19.08?5.0 mg)than that in the EPI group(2mg,P
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