1 Research Institute, HCor-Hospital do Coração, São Paulo, Brazil, fzampieri@hcor.com.br Intensive Care Unit, Hospital Sirio Libanes, São Paulo, Brazil, Emergency Medicine Discipline, University of São Paulo Medical School, São Paulo, Brazil Intensive Care Unit, Hospital Israelita Albert Einstein, São Paulo, Brazil, Intensive Care Unit, Hospital Municipal Dr Moysés Deutsch - M'Boi Mirim, São Paulo, Brazil Research Institute, HCor-Hospital do Coração, São Paulo, Brazil.