Comparison of Butorphanol and Tramadol Associated Patient-Controlled Analgesia (PCA) After Hysterectomy

Intravenous patient-controlled analgesia (PCA) is a popular technique for postoperative pain management. Although several drugs are recognized as effective therapeutic options, optimal selection of drugs in hysterectomy patients underwent different anesthesia treatments remains unknown explicitly. The investigators hypothesized that butorphanol and tramadol can produce different analgesic effects with intravenous PCA after abdominal hysterectomy.