Efficacy of Local Direct Median Nerve Block

local direct median nerve block is performed by surgeon using the 1%xylocaine with adrenaline 12 mL(5 mL subcutaneous at incision site and 7 mL over median nerve) (maximum dose 7 mg/kg) before the endoscopic carpal tunnel release(1-portal Agee technique)

brachial plexus block under ultrasound-guided is performed by experienced single anesthesiologist using the 1%xylocaine with adrenaline 15 mL (maximum dose 7 mg/kg) before the endoscopic carpal tunnel release(1-portal Agee technique)