NPPB and hydrops fetalis: High-risk type 1 (leucine ≥145 μM and phenylalanine ≥88.9 μM), high-risk type 2 (leucine <81.2 μM) were associated with higher event rates. The prognostic value of types 1 and 2 remained significant after adjusting for age, BNP, and other risk factors in HF