NPPB and atrial fibrillation: NT-proBNP had no significant correlationwith low postoperative cardiac output (P = 0.168),atrial fibrillation (P = 0.462), postoperativemyocardial infarction (P = 0.397), ICU length ofstay (P ≥ 0.050), prolonged mechanicalventilation (P = 0.121), length of hospitalstay(P ≥ 0.050), as well asin-hospital mortality after surgery (P =0.306).