NPPB and acute kidney injury: In the multivariate logistic analyses, both L-FABP and NT-proBNP were independent predictors of AKI when assessed as either continuous variables (p < 0.0001 and p = 0.006, respectively) or variables categorized by tertile (p < 0.0001 and p = 0.009, respectively, when comparing the third tertile with the first tertile) (Table 3).