NPPB and heart failure: This figure is comparable to the data from the Seattle Heart Failure Model17; however, our model is derived from only the BNP levels at discharge based on the pathophysiological assumption of BNP metabolism and by fitting the obtained equation to the actual data and validating the obtained equation using CV and another ADHF cohort, whereas Levy et al. obtained the predicted equation by fitting the survival to many factors using multivariate analysis and validating it with another cohort of CHF17.