NPPB and hydrops fetalis: Non-significant trends in ablation vs OMT arm towards lower:•All-cause mortality (HR 0.71, p = 0.066)•HF events (HR 0.79, p = 0.349)Greater improvements in ablation vs OMT arm at 2 yrs in:•MLHFQ (p = 0.0036)•6MWD (p = 0.025)•NT-proBNP (p < 0.0001)•LVEF (+10.1% vs + 3.8%, p = 0.017)