NPPB and chronic kidney disease: In this subgroup, admission BNP levels in the CKD + ADHF group (n = 35, 60.3%) were higher than those in the CHF - ADHF group (3047.2 ± 1229.3 pg/ml vs. 632.3 ± 492.2 pg/ml, P = 0.000; Figure 1b).