HCM | 1 | Pathological Q waves |
| 2 | ST segment flattening, depression, or both |
| 3 | Pronounced (>0.2 mV) T wave inversion |
| 4 | Left axis deviation |
ARVC | 1 | T wave inversion in anterior precordial leads |
| 2 | Ventricular extrasystoles with left bundle branch block morphology |
| 3 | QS complexes in leads V1–3 |
| 4 | QRS prolongation (<110 ms) in V1–3 |
| 5 | Epsilon waves |
WPW | 1 | Short PR interval |
| 2 | Delta wave |
Long QT syndrome | 1 | Prolonged QT and QTc intervals |
| 2 | U waves |
| 3 | Repolarisation abnormalities |
Brugada syndrome | 1 | Right bundle branch block and ST elevation in anterior precordial leads |