Association Between Renal and Right Cardiac Functions After Urinary Sodium Depletion Following Cardiac Surgery

The study will compare cardiac and renal data before and 6 hours after use of diuretic * Echocardiographic measure of right function (S wave, TAPSE, ventricle surfaces, inferior vena cava diameter) and left function (LVEF, cardiac output * Renal function: cumulative diuresis, creatinine level variation and incidence of acute kidney injury using KDIGO classification (creatinine level\>26.5 or diuresis\<0.05 ml kg-1 h-1)