NPPB and congestive heart failure: For CHF, both troponin and BNP appeared to contribute to risk prediction: the addition of troponin to the model that included the conentional risk factors along with BNP increased the C statistic from 0.767 to 0.777, while the addition of BNP to the troponin model increased the C statistic from 0.745 to 0.775.