NT-proBNP was associated with longerduration of mechanical ventilation (P = 0.013), ICUstay (P = 0.003), low cardiac output(P = 0.027), acute renal failure(P = 0.072), need for intra-aortic balloon pump(P = 0.072), and higher morbidity in thepostoperative period (0.001). Here, NPPB is linked to acute kidney injury.