Value of Cardiac Output Monitoring by Supra-sternal Doppler/Echocardiography in Intensive Care Unit

The aim of this study is to evaluate the concordance between the measurement of cardiac blood flow by non-invasive supra sternal ultrasound and the measurements performed by invasive monitoring in intensive care patients already equipped with an invasive monitoring. This invasive monitoring consists of catheters used to measure the cardiac output allowing the supply of organs and is installed when there is need to monitor the blood flow in different hemodynamic reasons. The patient's care will not be modified, the study just requires a supplementary measure in an exam already perform in the standard care. The principal hypothesis is that we can show a concordance between this non-invasive measure and the standard invasive monitoring.