Early repolarization: High-risk features
| J-point distribution | Lateral distribution is deemed low-risk compared with inferior and global distribution across all leads |
| J-wave amplitude | Amplitude ≥ 0.2 mV |
| ST-segment morphology | Horizontal or downsloping ST segment |
| QRS notching | Notching of the terminal portion of the QRS is more prevalent in patients with idiopathic ventricular fibrillation |