1 Associate Professor; Anesthesiology Department of the Faculdade de Ciências Médicas (FCM) of Universidade de Campinas (Unicamp) 2 R3; Unicamp 3 Professor; Physician, Anesthesiology Sector of the Hospital das Clínicas da Unicamp 4 Physician, Anesthesiology Sector of the Hospital das Clínicas da Unicamp 5 Student in Surgical Sciences at FCM/Unicamp; Physician of the Anesthesiology Sector of Hospital das Clínicas da Unicamp