Idiopathic ventricular fibrillation

Idiopathic ventricular fibrillation (IVF) is a rare and potentially life-threatening cardiac arrhythmia disorder characterized by episodes of ventricular fibrillation — a chaotic, disorganized electrical activity of the heart's lower chambers (ventricles) — that occurs in the absence of any identifiable structural heart disease, known channelopathy, or other recognizable cause. During an episode, the ventricles quiver ineffectively rather than pumping blood, leading to sudden cardiac arrest if not immediately treated. IVF is diagnosed only after thorough exclusion of all known causes of ventricular fibrillation, including coronary artery disease, cardiomyopathies, Brugada syndrome, long QT syndrome, short QT syndrome, catecholaminergic polymorphic ventricular tachycardia, and early repolarization syndrome. The primary clinical presentation is sudden cardiac arrest, often occurring without warning symptoms. Some patients may experience preceding episodes of syncope (fainting), palpitations, or dizziness. The condition predominantly affects the cardiovascular system and typically presents in otherwise healthy young to middle-aged adults. Survivors of an initial episode are at significant risk of recurrence. In some cases, a familial component has been identified, suggesting a possible genetic basis involving mutations in cardiac ion channel genes such as DPP6 and others, though in many patients no genetic cause is found. The cornerstone of treatment for idiopathic ventricular fibrillation is implantation of an implantable cardioverter-defibrillator (ICD), which continuously monitors heart rhythm and delivers life-saving electrical shocks to restore normal rhythm during episodes of ventricular fibrillation. Antiarrhythmic medications, particularly quinidine, may be used as adjunctive therapy to reduce the frequency of arrhythmic episodes. Catheter ablation targeting triggering premature ventricular contractions (PVCs), often originating from the Purkinje fiber network, has shown promise in selected patients. Isoproterenol infusion may be used acutely to suppress recurrent episodes (electrical storm). Long-term follow-up with a cardiac electrophysiologist is essential for ongoing management.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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