Comparison of ECG Features of ST Segment Elevation Acute Myocardial Infarction, Early Repolarization and Acute Pericarditis
| ECG feature | Myocardial infarction | Early repolarization | Acute pericarditis |
|---|---|---|---|
| ST segment morphology | Convex upwards | Convex upwards | Concave upwards |
| Typical magnitude of ST elevation | 1–10 mm | 1–2 mm | 1–5 mm |
| Distribution of ST elevation | Inferior, anterior and lateral patterns | Commonly septal, rarely limb leads | Both limb and chest leads |
| ST depression in V1 | In posterior infarction | Rare | Common |
| ST elevation in V6 | In infero- or anterolateral infarction | Uncommon | Common |
| ST/T wave evolution | Uniform in all involved leads | Does not occur | Various stages occur concurrently |
| Pathological Q waves | Commonly develop | Never develop | Never develop |
| PR segment depression | Not seen | Not seen | May be seen |
| Rhythm disturbances | May occur | Do not occur | Supraventricular tachyarrhythmias may occur |