Type A vs type B Wolff-Parkinson-White patterns
| Type A (associated with left-sided accessory pathway) | Type B (associated with right-sided accessory pathway) |
|---|---|
| Short PR interval (< 120 ms) | Short PR interval (< 120 ms) |
| Delta wave: broad QRS complex with slurred R wave | Delta wave: broad QRS complex with slurred S wave |
| May mimic right bundle branch block | May mimic left bundle branch block |
| Dominant R wave in V1 | Dominant S wave in V1 |
| Tall R waves and inverted T waves in leads V1–V3 | Tall S waves and inverted T waves in leads V4–V6 |
Based on information from reference 1.