Various centers will randomize 200 patients to receive either a total intravenous anesthesia with propofol or an anesthesia with sevoflurane. All patients will receive a standard middle dose opiates anesthesia. All the perioperative management will be otherwise identical and standardized. Transfer out of the intensive care will be performed with SpO2 94% or greater at an FiO2 of 0.5 or less by facemask, adequate cardiac stability with no hemodynamically significant arrhythmias, chest tube drainage less than 50 ml/h, urine output greater than 0.5 ml/kg/h, no intravenous inotropic or vasopressor therapy in excess of dopamine 5 ug/kg/min, and no seizure activity.