Evaluation of the Heart's Respiratory Quotient as Predictive Value After Extra-hospital Cardiac Arrest

It has been shown that elevation of the heart's respiratory quotient after cardiac surgery is predictive of the complications occurrence. In addition, a high heart's respiratory quotient is predictive of anaerobic metabolism after cardiac surgery. In the wake of cardiorespiratory arrest, the presence of anaerobic metabolism reflected by hyperlactatemia is an important prognostic factor. However, this monitoring is invasive and discontinuous. The hypothesis of the study is to show that a rise in the respiratory quotient by a non-invasive monitoring is a factor of poor prognosis in the wake of a Cardiac Arrest.