The efficacy of the block will be assessed by pinprick sensation (22 G needle) and compared with the opposite arm/hand for normal, hypoesthesia or no sensation. For patients with an ineffective block, supplementary local anesthesia will be administered according to the distribution of the block and site of surgery after measurement. If the patient experienced any pain during surgery, supplementary analgesia, sedation, or general anesthesia will be administered as required.