MONDO_0100234 (paroxysmal familial ventricular fibrillation) is a rare, genetic, cardiac rhythm disease characterized by ventricular fibrillation in the absence of any structural or functional heart disease, or known repolarization abnormalities. The presence of J waves is associated with a higher risk of nocturnal ventricular fibrillation events and a higher risk of recurrence. Also known as: IVF, idiopathic ventricular fibrillation, idiopathic ventricular fibrillation, non Brugada type, paroxysmal familial ventricular fibrillation (disorder), paroxysmal ventricular fibrillation, ventricular fibrillation, paroxysmal familial.