NPPB and hydrops fetalis: In contrast, a significant association with NT-proBNP level was detected between the occurrence of death (p = 0.030, Pearson χ2 = 7.014), the type of diagnosis (HF ± renal impairment) (p = 0.039, Pearson χ2 = 6.465), and the NYHA class at hospitalization (p = 0.0027, Pearson χ2 = 11.001).