NPPB and hydrops fetalis: Increasing age (hazard ratio (HR), 1.02; 95% confidence interval (CI), 1.01−1.03; P < 0.001), a history of diabetes (HR, 1.53; 95% CI, 1.26−1.86; P < 0.001), the etiology of the HF (nonischemic versus ischemic; HR, 1.28; 95% CI, 1.05−1.56; P = 0.013), NYHA functional class (class III + IV versus class II; HR, 3.04; 95% CI, 2.39−3.87; P < 0.001), and the level of serum NT-proBNP (HR, 1.55; 95% CI, 1.45−1.67; P < 0.001) were significantly and positively associated with the risk of the primary end point in our study.