Fig. 2From: A comparison of intraoperative goal-directed intravenous administration of crystalloid versus colloid solutions on the postoperative maximum N-terminal pro brain natriuretic peptide in patients undergoing moderate- to high-risk noncardiac surgeryBox plots showing perioperative plasma NT-proBNP concentrations between the colloid () and the crystalloid () group. Box plots demonstrate medians and interquartile ranges; asterisks represent extreme outliers. PreOP, Preoperative; PostOP, Postoperative; POD, Postoperative DayBack to article page