Introduction
Ventricular fibrillation (VF) is usually associated with structural heart disease.1 However, VF also occurs in patients without structural heart disease.2, 3 Early repolarization pattern or J point elevation in the inferior and/or lateral leads of the 12-lead electrocardiogram (ECG) is associated with pathogenesis in idiopathic ventricular fibrillation (IVF).4-6 Furthermore, J point elevation in the right precordial leads is also associated with IVF.7
Brugada syndrome (BrS) is also characterized by J point elevation in the right precordial leads and is associated with risk of ventricular fibrillation.8 The characteristic ECG pattern is often found only in the right precordial leads placed at second and/or third intercostal spaces in BrS.9 However, the significance of high precordial ECGs is unknown in IVF. In this study, we compared high right precordial ECGs between patients with idiopathic ventricular fibrillation and healthy controls. We also studied the association of J point elevation in high precordial ECGs with risk of VF recurrences.