Total 60 patients, American society of anaesthesiology physical status I-II aged between
18-65 who underwent totally mastectomy will recruit to the study. The patients randomly
divided into two groups. Ultrasound guided Erector spinae plane block (ESP) will perform with
15 ml bupivacaine+ 5 ml lidocaine in Group ESP and ultrasound guided serratus anterior plane
(SAP) block will perform with 5 ml bupivacaine+ 5 ml lidocaine in Group SAP. Postoperative
pain assessment will apply with 11-point numerical rating scale (NRS) and postoperative
analgesic requirement will calculate and record with morphine consumption (patient controlled
analgesia).