| P wave | Depolarization of atrial muscle |
| QRS complex | Depolarization of ventricular muscle |
| T wave | Ventricular repolarization |
| PR interval | Time from start of atrial depolarization to start of ventricular depolarization (12–20 sec) |
| QRS interval | Total time for ventricular depolarization (6–10 sec) |
| QT interval | Total time for ventricular depolarization and repolarization |
| Rate/rhythm | 60–100, regular |
| P-QRS ratio | 1:01 |
(From Venes, D [ed]: Taber's Cyclopedic Medical Dictionary, ed 21. FA Davis, Philadelphia, 2009.