NPPB and acute coronary syndrome: There were a total of 382 consenting patients with acute coronary syndrome undergoing isolated first-time CABG with at least one available NT-proBNP as follows: preoperative (n = 366), postoperative day 1 (POD1; n = 320), and postoperative day 3 (POD3; n = 325) and data from all three time points available in 267 patients.