Ibutilide is commonly used for conversion of atrial fibrillation (AF) during catheter ablation procedure. Sinus arrest or Torsades de Pointes (TdP) is mainly complication of ibutilide, however, is recovery spontaneously after a few hours.We present a patient suffering long persistent sinus arrest and Torsades de pointes following administration of ibutilide for cardioversion of persistent AF after radiofrequency ablation.