In contrast, there was a positive correlation between NT-proBNP and acylcarnitines in the PH-HF group, with C2-AC (R2 = 0.25, p = 0.004), C18:1AC (R2 = 0.25, p = 0.004), and C18:2AC (R2 = 0.22, p = 0.007). Here, NPPB is linked to hydrops fetalis.