| 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
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| 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 |