The aim of this study is to compare the analgesic efficacies of the modified pectoral plane block (PECS II) and the erector spinae plane block (ESPB) after modified radical mastectomy surgery through assessment of post-operative pain severity by Visual Analogue Score at PACU as a primary outcome and at 2 hours, 4 hours, 8 hours, 12 hours, 18 hours and 24 hours post-operatively also by comparing time of first rescue analgesia and cumulative post-operative meperidine consumption in the first 24 hours as secondary outcomes.
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Post-operative Pain Severity Assessed by Visual Analogue Scale Immediately Postoperative on Admission to the Post Anesthesia Care Unit.
Timeframe: will be evaluated postoperatively on arrival to PACU (zero time)