Recommendations for risk stratification for sudden cardiac death proposed by the European Society of Cardiology (ESC): Wolff-Parkinson-White syndrome

Finding	Recommendations
Short (<250 ms) RR interval during atrial fibrillation	Class IIa
Short (<270 ms) anterograde refractory period of the accessory pathway	Class IIa
Multiple accessory pathways	Class IIa
Loss of pre-excitation ajmaline or procainamide test (lower risk)	Class IIb
Syncope	Class III
Classification
Class I: Conditions for which there is evidence and/or general agreement that a given procedure or treatment is useful and effective.
Class II: Conditions for which there is conflicting evidence and/or a divergence of opinion about the usefulness/efficacy of a procedure or treatment.
Class IIa: Weight of evidence/opinion is in favor of usefulness/efficacy.
Class IIb: Usefulness/efficacy less well established by evidence/opinion.
Class III: Conditions for which there is evidence and/or general agreement that the procedure/treatment is not useful and in some cases may be harmful.

Recommendations from the European Society of Cardiology for additional risk stratification for sudden cardiac death in patients with specific clinical findings in the setting of Wolff-Parkinson-White syndrome.

Priori SG, Aliot E, Blomstrom-Lundqvist C, et al. Eur Heart J 2001; 22:1374.

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Recommendations for risk stratification for sudden cardiac death proposed by the European Society of Cardiology (ESC): Wolff-Parkinson-White syndrome