Lidocaine as an Anesthetic Adjuvant in Liver and Gastric Laparoscopic Surgery

Inclusion Criteria: * Men and women over 18 years of age scheduled for gastric or liver cancer surgery through a laparoscopic approach at the University of Girona Dr Josep Trueta. * Accept and sign the informed consent Exclusion Criteria: * decline participating in the study at any stage of its development. * History of allergic or adverse reactions to Amide-type anesthetics. * Pregnancy or lactation period * Diagnosis of Child-Pugh stage B or C liver failure. * Acute renal failure (GFR \<60 ml / min). * Concomitant treatment with opioids for chronic pain. * Any condition that, in the clinical judgment of the researchers, may interfere with the object of the research.