Carlo Banfi1, Karim Bendjelid2, Raphaël Giraud2. 1. Division of Cardiovascular Surgery, Geneva University Hospitals, Geneva, Switzerland; Faculty of Medicine, University of Geneva, Geneva, Switzerland; Geneva Hemodynamic Research Group, Geneva, Switzerland. 2. Faculty of Medicine, University of Geneva, Geneva, Switzerland; Geneva Hemodynamic Research Group, Geneva, Switzerland; Intensive Care Service, Geneva University Hospitals, Geneva, Switzerland.