| Diagnosis | Confirmatory clues |
| True posterior infarct | ST ↓, T ↑ in V1-V2; Q waves and ST ↑ V7-V9 |
| Right ventricular hypertrophy | RAD; RAE; secondary ST-Ts; V7-V9 normal |
| Ventricular septal hypertrophy | Associated Q waves; LVH; V7-V9 normal or deep narrow Q waves |
| Right bundle branch block | Wide QRS; broad S in V1, V6; R peaks late in V1; V7-V9 normal or broad S waves |
| Wolff-Parkinson-White syndrome | Short PR; delta wave; V7-V9 normal or delta wave |
| Normal variant | No other abnormalities |
