Brief summary: Regional anesthesia decreases the need for intravenous analgesia in the peri-operative period. Erector spinae plane (ESP) is a regional anesthesia technique shown to be effective at the dorsal and ventral rami of the thoracic spinal nerve along with sympathetic nerve fibers. The purpose is to demonstrate the contribution of ESP block to the postoperative analgesia by ultrasonography and to increase intraabdominal tissue oxygenation compared to the control group.
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FLACC scale
Timeframe: From recovery of anesthesia to end of study ( postoperative 24 hours)
NIRS
Timeframe: Before anesthesia induction to end of operation ( intraoperative 2 hours )