NPPB and anemia (phenotype): On the other hand, patients with anemia had higher levels of NT-pro-BNP (1041 vs. 430 pg/mL, p = 0.002), BUN (21.1 vs. 17.3 mg/dL, p = 0.001), and serum creatinine (1.0 vs. 0.9 mg/dL, p = 0.036).