Prevalence of prominent J waves in patients presenting with ventricular fibrillation without structural heart disease: A single-center study

SummaryAssociation between sudden cardiac arrest and early repolarization (QRS slurring in the inferolateral leads) has drawn recent attention. We retrospectively assessed the prevalence of electrocardiographic J waves in 19 men aged 46.5 ± 13.7 years who, between 1979 and 2011, were resuscitated after cardiac arrest due to ventricular fibrillation. There was no structural heart disease in this group. The J wave is an elevation of the QRS-ST junction of at least 0.1 mV from baseline in the inferior or lateral leads, manifested as QRS slurring or notching. Eleven patients (age, 37.3 ± 13.9 years) showed J waves in the inferior leads (n = 8) or in both the inferior and lateral leads (n = 3). Brugada syndrome was diagnosed in 5 patients (age, 46.4 ± 15.7 years). The QRS complex was normal in the remaining 3 patients (age, 44.3 ± 9.5 years). Ventricular fibrillation was induced by programmed ventricular stimulation with up to 3 extrastimuli from the right ventricular apex or outflow tract in 7 of the 10 J-wave syndrome patients tested, in all 5 Brugada syndrome patients, and in all 3 patients with a normal electrocardiogram. There appears to be an increased prevalence of J-wave syndrome among patients with a history of idiopathic ventricular fibrillation.