Primary outcome: pain
NRS pain, chronic neuropathic pain, Pain
No significant difference (p = 0.54) was observed in the NRS pain scores reported by the two patient groups 12 months after mastectomy (Fig. Pain scores and medication consumption in both experimental groups: general anesthesia (n = 22) and general anesthesia with SAM + PECS I blocks (n = 22). (Likewise, no significant difference (p = 0.379) was observed in the percentage of patients reporting DN4 punctuation > 4, as illustrated in Fig. Figure Comparison of the DN4 tool versus clinical evaluation for the probable chronic neuropathic pain after mastectomy.Data regarding the number of patients that presented probable chronic neuropathic pain after mastectomy. General + SAMP/PECS I: patients submitted to the general anesthesia associated with serratus anterior muscle (SAM) block and pectoral nerves (PECS) block type I during mastectomy procedure (n = 22 patients). General anesthesia: patients submitted to general anesthesia only during mastectomy procedure (n = 22 patients).