ALTERVOLHemodynamic Indices Predictive of a Beneficial Response to Fluid Expansion in Case of Hemodynamic Failure After Cardiac Surgery With Altered Preoperative Ejection Fraction (LVEF≤45%): Sensibility and Specificity of Respiratory Variations of Pulse Pressure (∆PP), Photoplethysmography (∆POP), Perfusion Index (PVI), Before and After Fluid Expansion.

Low Cardiac Output Syndrome occurs frequently after cardiac surgery, especially when pre-operative LVEF is altered (LVEF≤45%). The correction of hemodynamic failure requires adapted treatments: fluid expansion and/or inotropic or vasoactive drugs. Predictive indices of a response to fluid challenge may allow an earlier hemodynamic optimization, which has not been showed until now when LVEF is altered.