Emanuele Piraccini1, Eleonora De Lorenzo2, Stefano Maitan3. 1. Department of Surgery, Anesthesia and Intensive Care Section "G.B. Morgagni-Pierantoni" Hospital, Forlì, Italy - drpiraccini@gmail.com. 2. School of Anesthesia, University of Ferrara, Ferrara, Italy. 3. Department of Surgery, Anesthesia and Intensive Care Section "G.B. Morgagni-Pierantoni" Hospital, Forlì, Italy.