Glenn Hernández1, Flávia Machado2, Gustavo Ospina-Tascón3. 1. Departamento de Mecicina Intensiva, Pontificia Universidad Católica de Chile, Santiago. 2. Discipline of Anesthesiology, Pain, and Intensive Care, Federal University of São Paulo, São Paulo, Brazil. 3. Intensive Care Medicine Department, Fundación Valle del Lili-Universidad ICESI, Cali, Colombia.