Peak Plasma Levels of Bupivacaine After a Pecto-Intercostal Fascial Block Post-Sternotomy for Cardiac Surgery

Inclusion Criteria: * ASA l-lll * Undergoing sternotomy for cardiac surgery under a PIFB and general anesthesia Exclusion Criteria: * Patient's refusal or inability to consent * Allergy, hypersensibility or resistance to local anesthetic * Contraindication to regional anesthesia: infection in the designated area, severe congenital coagulopathy or inadequate hemostasis before PIFB * Severe hepatic (Child B and C) or renal insufficiency (GFR\<30 mL/min)