NPPB and hydrops fetalis: HF patients with NT-proBNP levels <500 pg/mL, had an EF of 40.25 ± 13.27 n = 14 that was significantly higher than patients with an NT-proBNP level of 500 pg/mL or higher, 24.78 ± 8.42 n = 9 (Table 3, p = 0.005 Student’s T-test).