- regular rhythm; 
- PR <0.12 sec / QRS >0.11 sec; 
- Delta wave; 
- May cause SVT/ 
- May cause severe A. fib/atrial flutter 
- May have q waves depending on the tract: (Non MI q waves); Management:
- quinidine 200 to 400 mg PO tid/qid is useful; 
- Propanolol / Procainamide may also be tried; * NOTE: Digoxin & Verapamil are CONTRAINDICATED w/ WPW syndrome & A. fib