Preload Dependency by Impedance Cardiography After Cardiac Surgery

Noninvasive Assessment of Preload Dependency by Passive Leg Raising Test and Impedance Cardiography Compared to Echocardiographic Measurements After Cardiac Surgery

The primary purpose of this study is to investigate wether the measure of stroke volume (SV) variations by impedance cardiography during passive leg raising (PLR) can reliably predict preload dependency after cardiac surgery, in comparison to a reference parameter : velocity time integral (VTI) variation measured by transthoracical echocardiography.

Inclusion Criteria:

• Men or women over 18 years
• Affiliated to a social protection
• Signed written consent
• Informed about the results of the medical visit
• All type of cardiac surgery with extracorporeal circulation performed at University Hospital of Strasbourg
• Sedated and under mechanical ventilation

Exclusion Criteria:

• Cardiac arrhythmia
• Contraindication to PLR maneuver
• Exclusion period due to inclusion in a previous or ongoing study
• Impossibility to provide enlightened information
• Patient deprived of liberty, under judicial protection, trusteeship or guardianship
• Pregnancy, lactation