[12-year follow-up of a patient after successful ablation of incessant fascicular tachycardia with biventricular heart failure and severe sinus node dysfunction].

We present a case of a 14 year-old boy with a incessant fascicular tachycardia with retrograde conduction and tachycardiomyopathy. Verapamil, adenosine, lignocaine and repeated cardioversions were unsuccessful in termination of tachycardia. Amiodarone however caused sinus node dysfunction and temporary electrode pacing had to be used. The patient underwent successful radiofrequency catheter ablation in the area of the left posterior fascicle. Because of ventricular extrasystoles (with QRS morphology resembling that of fascicular VT) the patient underwent second ablation which significantly reduced the number of ventricular beats. The course of subsequent 12-year follow-up was uneventful.