NPPB and acute kidney injury: The s-HFABP level demonstrating an optimal balance between sensitivity and specificity for detecting the presence of AKI (70.3 and 72.8 %, respectively; AUC: 0.774; 95 % CI: 0.728–0.819) was 15.7 ng/mL for the overall patients, while that for the Nt-proBNP level was 13,829 ng/L (29.0 and 88.8 %, respectively; AUC: 0.618; 95 % CI: 0.562–0.673), and that for the hs-TropT level 48 ng/L was (64.8 and 56.3 %; AUC: 0.622; 95 % CI: 0.570–0.675) (Fig. 3-a).