NPPB and hydrops fetalis: Under HF medical therapy, a significant improvement in ejection fraction from 30.2 ± 7.8% to 37.6 ± 10.0% (p ≤ 0.001) and a significant decrease of NT-proBNP to 1416.7 ± 2145 pg/mL (p = 0.008) was shown.