Mean plasma bupivacaine concentrations following pectoral nerve blocks (PECS II).

Pectoral nerve blocks (PECBs) provide analgesia after breast surgery.[1–3][1] Plasma concentration levels of bupivacaine (PCLBs) following fascial plane injections can exceed the threshold for local anesthetic systemic toxicity (LAST, mean venous level of 2.1 µg/mL), as described following