Wu JT, et al. - After successful accessory pathway (AP) ablation, researchers examined if advanced interatrial block (IAB) could predict the risk of atrial fibrillation (AF) recurrence in patients with verified paroxysmal AF and Wolff-Parkinson-White (WPW) syndrome. In this retrospective study involving 103 patients with WPW syndrome who had paroxysmal AF. In patients with WPW syndrome, advanced IAB and age > 50 years were independent predictors of AF recurrence after successful AP ablation. Overall, the authors concluded that the presence of advanced IAB may be used in patients with verified paroxysmal AF and WPW syndrome to predict future recurrence of AF after successful ablation of AP.