Physioflow® is a new device for measuring cardiac output in a non-invasive way using a thoracic bioimpedance technique. This technique has been validated in patients in stress tests as well as in Chronic Obstructive Pulmonary Disease (COPD) patients, in obese patients and in children. Very little work has been published in intensive care unit (ICU) and no studies have been done on hemodynamically unstable patients. The aim of this work is to compare the cardiac output measured by Physioflow® to the transthoracic echocardiography (TTE) in ventilated, sedated patients hospitalized in ICU receiving catecholamines and for whom the attending physician wants to evaluate the fluid responsiveness using the TTE and a passive leg raising maneuver (PLR).
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Measure of cardiac output with transthoracic echocardiography (TTE) before PLR
Timeframe: during one hour , the day of inclusion
Measure of Cardiac output with Physioflow before PLR
Timeframe: during one hour , the day of inclusion
Measure of cardiac output with transthoracic echocardiography (TTE) after PLR
Timeframe: during one hour , the day of inclusion
Measure of cardiac output with Physioflow after PLR
Timeframe: during one hour , the day of inclusion