Elena Spinelli1, Enzo M Dellino1, Tommaso Mauri2,3. 1. Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy. 2. Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy. tommaso.mauri@unimi.it. 3. Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy. tommaso.mauri@unimi.it.