Correlation study between the data provided by two measurement systems, trans- pulmonary thermodilution and ClearSight © (non invasive), to determine the interest in routine use (cardiac output, cardiac index, stroke volume and blood pressure).

Since 2014, Edwards society has developed a completely non-invasive monitoring device for measurement of blood pressure and continuous cardiac output without inserting foreign intravascular bodies in the patient. Initially tested on healthy volunteers cardiac disease -free, the correlation with the other devices seems to be good. If this ClearSight © system show a relevant accuracy in measuring blood pressure and cardiac output with a specific ICU hospitalized population, it could justify its place in the therapeutic arsenal of monitoring in intensive care.

This is a common care ,prospective observational single center study , concerning the results of blood pressure , cardiac output values and their variations.

Inclusion Criteria:

• age>18
• hospitalized in surgical ICU, with hemodynamic instability or vaso-active drugs
• No opposition formulated

Exclusion Criteria:

• Impossibility of establishment of one of the cardiac output measurement devices
• Pregnant woman
• Refuse to participate

Adults patients hospitalized in ICU with hemodynamic failure requiring vasoactive drugs