[Ventricular fibrillation secondary to radiofrequency application in ventricular tachycardia ablation]. / Fibrilación ventricular secundaria a la aplicación de radiofrecuencia en la ablación de una taquicardia ventricular.

Radiofrequency catheter ablation has become a first line therapy for several types of tachycardias because of its high efficacy and low complication rate. The development of proarrhythmic complications due to a direct effect of radiofrequency is very unusual. We describe a patient with previous myocardial infarction and well tolerated sustained monomorphic ventricular tachycardia who underwent catheter ablation of the tachycardia substrate. During two of the radiofrequency applications, ventricular fibrillation developed and external defibrillation was required.

[Proarrhythmic effect following radiofrequency catheter ablation of repetitive monomorphic ventricular arrhythmia]. / Efecto proarrítmico tras la ablación con radiofrecuencia de una arritmia ventricular monomórfica repetitiva.

Radiofrequency catheter ablation is a first line therapy for many supraventricular and some ventricular tachycardias due to a high success rate and a low probability of complications. Although the majority of them are related to the catheterization technique, some are due to a direct effect of radiofrequency application. We report a patient with a nonsustained, repetitive, monomorphic ventricular arrhythmia that presented, after a successful radiofrequency ablation, an incessant sustained monomorphic ventricular tachycardia requiring a new ablation procedure.