Fig. 1From: Utility of NT-proBNP as an objective marker of postoperative heart failure after coronary artery bypass surgery: a prospective observational studyPerioperative NT-proBNP levels in patients without postoperative heart failure (PHF), with PHF and severe PHF. Data given as medians with interquartile range. Mann-Whitney U test was performed and p < 0.05 was considered significant, indicated by*Back to article page