245 Incidence of atrial fibrillation in patients with history of paroxysmal supraventricular tachycardia

Patients (pts) with history of paroxysmal supraventricular tachycardia (PSVT) have a higher risk of atrial fibrillation (AF) than other pts. The purpose of the study was to evaluate the incidence of AF in pts seen for PSVT and to look for the factors of AF. Population 1099 pts aged from 5 to 85 years were consecutively studied for spontaneous PSVT that was confirmed by electrophysiological study (EPS). Pts with anterograde conduction through an accessory pathway were excluded. Methods The history of spontaneous AF was noted. Clinical factors (age, gender, heart disease) and electrophysiological factors were noted. Pts with and without AF were compared. Results 62 pts developed documented paroxysmal or permanent AF or flutter (6%). Several clinical factors were associated with AF: pts were older than 1037 pts without AF (59 ± 13 years vs 50 ± 19, p Conclusions The incidence of AF was 6% in 1099 consecutive patients who had PSVT. The risk was correlated with the classical factors of AF, the older age, the male gender and the presence of HD. The mechanism of the reentry does not change the incidence of AF but the induction of AF is more frequent than in other patients. Thus, patients with PSVT and with these risk factors should be carefully followed.