NPPB and heart failure: At 30 days, heart failure readmission and death occurred in 29 patients; the NGAL serum level was higher in patients with events (134 versus 84 ng/mL, P < 0.001) and NGAL was an independent predictor of events in multivariable models (P = 0.001), while BNP was only of borderline significance (P = 0.052).