Table. High-Risk Features of Early Repolarization Patterns Seen on Routine Electrocardiograms
J point distribution: Inferior or global distribution across all leads considered high risk compared to lateral distribution that is deemed low risk
J wave amplitude: Amplitude ≥0.1 mV
ST segment morphology: Horizontal or downsloping ST segment
Coexisting electrical disorder: Conditions such as Brugada syndrome or short QT syndrome
Dynamic J wave: High amplitude and transient augmentation of J wave patterns
Family history of sudden cardiac death: First-degree relative
History of resuscitation from cardiac arrest: Cardiac arrest resulting from documented ventricular fibrillation or polymorphic ventricular tachycardia