Number of patients with unsatisfactory pain relief defined as average visual analog scale (VAS) more than 5 with or without requirement of IVPCA for pain relief during the first 48 hours postoperative period will be compared between the two groups and form the primary outcome for the study. Postoperative pain intensity will be measured by Visual Analog Scale (VAS) with 0- being no pain and 10-being maximum pain and the analgesic efficacy in both groups will also be evaluated by the amount of total narcotic consumption (measured with IV morphine equivalent doses of analgesics used to provide pain relief).
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Postoperative Pain Intensity
Timeframe: PACU admission every thirty minutes until discharge to the floor and thereafter every four hours for first 24-hour, then every six hours until 48 hours and then every twelve hours until 72 hours postoperatively.