Advanced arrhythmias and channelopathies - Wolff–Parkinson–White syndrome
Description
- Accessory AV pathway (bundle of Kent) bypassing the AV node
- WPW pattern = pre-excitation on ECG. WPW syndrome = pattern + arrhythmia
| Orthodromic AVRT | Antidromic AVRT | |
|---|---|---|
| Down | AV node | Accessory pathway |
| Up | Accessory pathway | AV node |
| QRS | Narrow, no delta wave | Wide, delta wave |
| P wave | Retrograde, after QRS | Retrograde, before next QRS |
| Frequency | Common (~90-95%) | Uncommon |
| Mimics | SVT | VT |
- *AF with pre-excitation is the lethal one* - irregular, wide, beat-to-beat varying QRS, very rapid
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