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The pain scores were also comparable at 4, 6, 12, and 24 h; but statistically significantly lower in PECS group at 2 and 18 h. The total intraoperative fentanyl consumption was also reduced in PECS group (P = 0.009). Only 9 patients in PECS group (796.5 min) as compared to 22 patients in CONTROL group (387.7 min) required rescue analgesia (P  =  0.001). Pectoral nerve block benefits patients undergoing mastectomy by achieving similar post-operative pain scores with decreased consumption of intraoperative and post-operative opioids. Reg