Introduction: Total abdominal hysterectomy (TAH) is one of the most common surgery performed in gynecology. Transversus Abdominis Plane (TAP) block as a part of multimodal anesthesia is being increasingly used in patients undergoing total abdominal hysterectomy for benign as well as malignant conditions. It is easy to perform, technically simple, pharmacologically safe, effective and economically cheap. TAP block is a part of multimodal analgesic regimen and improved analgesia, decreased opioid consumption and its side effect during postoperative period. The purpose of this study was to evaluate effectiveness of TAP block to provide effective postoperative analgesia in patients undergoing total abdominal hysterectomy. Materials and Methods: This was a prospective case control study of 100 patients undergoing total abdominal hysterectomy under TAP block. The institutional ethical committee approved the study and an informed written consent was obtained from all the patients. The patients were included in this study on the basis of a predefined inclusion and exclusion criteria. Amongst 100 cases included in this study 50 patients were given USG guided TAP block with ropivacaine (n =50) [TAP BLOCK GROUP] versus placebo (n=50) [CONTROL GROUP]. All patients underwent routine investigations such as complete blood count, coagulation profile, bleeding time, clotting time, ECG, LFT and KFT. If indicated further investigations were done in selected cases. Perioperative and postoperative hemodynamic parameters, VAS scores, ETCO2 levels requirement of rescue analgesia, Mean sedation scores and incidence of Postoperative nausea and vomiting (PONV) were compared in both the groups. P value less than 0.05 was taken as statistically significant. Results: Mean age, height, weight and duration of surgery in both the groups were found to be comparable. The control group was found to have a higher heart rate, systolic BP, Diastolic BP and mean arterial pressures as compared to TAP block group at 5,10,15,20,30,40,50,60,75 and 90 minutes as well as in postoperative period and the difference was found to be statistically "highly significant" (P<0.0001). The analysis of VAS scores of the patients in post-operative period showed that Median VAS score at 1st hour was 3.
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