After considering these interactions, the associations with NT-proBNP were significant only in the PH-HF group, irrespective of the metabolite considered: acylcarnitines (C2-AC, p < 0.01; C18:1-AC, p < 0.01; C18:2-AC, p < 0.05), MUFA (C18:1n7, p < 0.01; C18:1n9, p < 0.01), and PUFA (C20:4n6, p < 0.01; C20:5n3, p < 0.05). Here, NPPB is linked to hydrops fetalis.