Evaluation of Pectoral Nerve Blocks Type II (PEC II) for Augmentation Mammoplasty: Prospective, Randomized, and Double-Blind Study

Objective: to study the effectiveness of type II pectoral nerve block (PEC II) for breast augmentation with submuscular implants by assessing opioid consumption and pain scale in the immediate postoperative period, from the post-anesthesia care unit (PACU) to 24 h postoperatively. Methods: A prospective, controlled, randomized, and double-blind study. Thirty-four patients were analyzed during the perioperative period and in the PACU, with one group receiving bilateral PEC II combined with general anesthesia and the control group receiving only general anesthesia. Results: There was no difference between the groups regarding demographic data, surgical and anesthetic times, or intraoperative opioid use. Opioid consumption in the control group was consistently higher at all the time intervals studied, with an average morphine consumption 38.7% greater. The largest variation in morphine consumption occurred at the fourth and sixth hours postoperatively. The greatest difference in postoperative pain was 36% higher in the control group compared to the intervention group. Conclusions: patients who underwent general anesthesia combined with PEC II had lower opioid consumption and a lower postoperative pain score without associated complications, confirming the effectiveness of the procedure.