Normal values
| Heart rate | 60 - 100 bpm |
||
| PR interval | 0.12 - 0.20 s |
||
| QRS interval | ≤ 0.12 s |
||
| QT interval | < half RR interval (males < 0.40 s; females < 0.44 s) |
||
| P wave amplitude (in lead II) | ≤ 3 mV (mm) |
||
| P wave terminal negative deflection (in lead V1) | ≤ 1 mV (mm) |
||
| Q wave | < 0.04 s (1 mm) and < 1/3 of R wave amplitude in the same lead |