The purpose of this study was to investigate the effectiveness of preemptive effect of rectus sheath block (RSB) and intercostal nerve block (ICNB) on postoperative visceral pain in laparoscopic cholecystectomy (LLC). After induction of general anesthesia, group of patient is decided randomly. In Group pre, RSB and ICNB are performed with 0.25% Ropivacaine 40ml before the operation. In Group post, RSB and ICNB are performed with 0.25% Ropivacaine 40ml after the operation. Measure the NRS and compare the rescue analgesic dose used at 0, 0.5, 1, 2, 6, 9, 18, and 24 hours after arrival at the recovery room.
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Difference of analgesic consumption between both group
Timeframe: at 0, 0.5, 1, 2, 6, 9, 18, 24 hours after operation