title: Organized atrial tachycardias after atrial fibrillation ablation.
abstract: The efficacy of catheter-based ablation techniques to treat atrial fibrillation is limited not only by recurrences of this arrhythmia but also, and not less importantly, by new-onset organized atrial tachycardias. The incidence of such tachycardias depends on the type and duration of the baseline atrial fibrillation and specially on the ablation technique which was used during the index procedure. It has been repeatedly reported that the more extensive the left atrial surface ablated, the higher the incidence of organized atrial tachycardias. The exact origin of the pathologic substrate of these trachycardias is not fully understood and may result from the interaction between preexistent regions with abnormal electrical properties and the new ones resultant from radiofrequency delivery. From a clinical point of view these atrial tachycardias tend to remit after a variable time but in some cases are responsible for significant symptoms. A precise knowledge of the most frequent types of these arrhythmias, of their mechanisms and components is necessary for a thorough electrophysiologic characterization if a new ablation procedure is required.
authors.affiliation: Robotic Cardiac Electrophysiology Unit, Department of Cardiology, University Hospital La Paz, Paseo de la castellana, No 261, 28046 Madrid, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: Castrejón-Castrejón
authors.forename: Marta
authors.initials: M
authors.lastname: Ortega
authors.forename: Armando
authors.initials: A
authors.lastname: Pérez-Silva
authors.forename: David
authors.initials: D
authors.lastname: Doiny
authors.forename: Alejandro
authors.initials: A
authors.lastname: Estrada
authors.forename: David
authors.initials: D
authors.lastname: Filgueiras
authors.forename: José L
authors.initials: JL
authors.lastname: López-Sendón
authors.forename: José L
authors.initials: JL
authors.lastname: Merino