Asymptomatic ventricular preexcitation: A long-term

Background. Sudden cardiac death can be the first clinical presentation of asymptomatic ventricular preexcitation. Methods and Results. From 1995 to 2005 we prospectively collected clinical and electrophysiologic data among 293 adults with asymptomatic ventricular preexcitation (61.4 % males; median age, 36 years; interquartile range (IQR, 28-47.5). After electrophysiologic testing, patients were prospectively followed taking no drugs. Primary end point of the study was the occurrence of a first arrhythmic event. Predictors of arrhythmic events were analyzed by univariate and multivariate Cox models. Over a median follow-up of 67 months (min-max, 8-90) after electrophysiologic testing, 262 patients (median age, 37 years; IQR, 30-48) did not experience arrhythmic events, remaining totally asymptomatic, while 31 patients (median age, 25 years; IQR, 22-29; median follow-up 27 months, min-max 8-55) had a first arrhythmic event, which was potentially life-threatening in 17 of them (median age, 24 years; IQR, 20-28.5; median follow-up 25 months, min-max 9-55). Potentially life-threatening tachyarrhythmias resulted in resuscitated cardiac arrest (1 patient), pre-syncope (7 patients) syncope (4 patients), or dizziness (5 patients). In multivariate analysis age (p=0.004), inducibility (p=0.001) and anterograde effective refractory period of the accessory pathway ≤250 ms (p=0.001) predicted potentially life-threatening arrhythmias. Conclusions. These results indicate that prognosis of adults who present with asymptomatic ventricular preexcitation is good and the risk of a significant event is small. Short anterograde effective refractory period of the accessory pathway and inducibility at baseline are independent predictors of potentially life-threatening arrhythmic events and the risk decreases with increasing