- By-pass tract connecting atria to ventricle
- Can conduct impulses antegrade (atria--> ventricle) or retrograde (ventricle--> atria)
- Can present in teenage years or older
- Develop for unknown reasons
- Also unclear as to what triggers them to become functional
- Palpitations, awareness of racing heart, SOB, chest discomfort
- Lightheadedness, presyncope or syncope
- Can have very rapid rates, 150-250
- Might capture on EKG if done when symptomatic
- If transient symptoms, can capture w/holter or longer term event monitor