The correlation efficient between preoperative NT-ProBNP concentrations with durations of anesthesia, cardiopulmonary bypass, aortic cross clamp, postoperative ICU stay, intubation / ventilation, inotropic-vasopressive medication and hospitalisation length were 0.2271, 0.2273, 0.2221, 0.4814, 0.5250, 0.6714 và 0.4279, respectively.