Zaccaria Ricci1, Stefano Romagnoli2, Claudio Ronco3,4. 1. Department of Cardiology and Cardiac Surgery, Pediatric Cardiac Intensive Care Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy. 2. Department of Anesthesiology and Intensive Care, Azienda Ospedaliero-Universitaria Careggi, Largo Brambilla, Florence, Italy. 3. Department of Nephrology, Dialysis and Transplantation, San Bortolo Hospital, Vicenza, Italy. 4. International Renal Research Institute of Vicenza, Vicenza, Italy.