NPPB and congestive heart failure: Our analysis showed highly positive correlations between NYHA class and NT-proBNP (Figure 1A; ρ = 0.732, p < 0.001) or LVEDV (Figure 1B; ρ = 0.377, p < 0.005), indicating a proper CHF patient allocation for disease severity and the expected relationships between functional status, NP levels, and LV remodeling.