Therapeutic Efficacy of Intravenous Lidocaine Infusion Compared With Epidural Analgesia for Postoperative Pain Control in Adult Patients Undergoing Major Abdominal Surgery: Non-Inferiority Clinical Trial

"The epidural infusion will be as follows:~* Isobaric Bupivacaine 0.5% 40 cc~* Morphine 4 mg (1 ampoule up to 10 cc and 4 cc of the mixture will be applied)~* Saline solution 0.9% 156 cc.~* Total Volume: 200 cc.~This mixture will be prepared by a nurse outside the research group outside the operating room once indicated.~The infusion will be scheduled at 7 cc / hour per continuous infusion set and will be connected to the epidural catheter after its placement."

2% Lidocaine IV without epinephrine: 1 mg/kg/ hour for up to 24 hours, started immediately after anesthetic induction.