Zaccaria Ricci1, Stefano Romagnoli2. 1. Department of Cardiology and Cardiac Surgery, Pediatric Cardiac Intensive Care Unit, Bambino Gesù Children's Hospital, IRCCS, Piazza S.Onofrio 4, 00165, Rome, Italy. zaccaria.ricci@gmail.com. 2. Department of Anesthesia and Intensive Care, University of Florence, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy.