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Cardiology Research and Practice
Volume 2011 (2011), Article ID 957538, 16 pages
http://dx.doi.org/10.4061/2011/957538
Review Article

Organized Atrial Tachycardias after Atrial Fibrillation Ablation

1Robotic Cardiac Electrophysiology Unit, Department of Cardiology, University Hospital La Paz, Paseo de la castellana, No 261, 28046 Madrid, Spain
2Department of Pediatric Cardiology, University Hospital La Paz, Paseo de la castellana, No 261, 28046 Madrid, Spain

Received 15 November 2010; Revised 17 April 2011; Accepted 17 May 2011

Academic Editor: Miguel A. Arias

Copyright © 2011 Sergio Castrejón-Castrejón et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.