Abstract
Background
Prior investigators note successful ablation of both typical cavotricuspid isthmus-dependent and scar-related macroreentrant right atrial flutters (AFL) in adult patients with repaired tetralogy of Fallot (TOF). However, an analysis of the mechanisms (including a description of a uniform approach to diagnose such mechanisms), and clinical outcomes of catheter ablation in a consecutive series of adult patients with AFL late after surgical TOF repair has not been previously reported.
Methods
Background clinical data and follow-up were evaluated in a consecutive series of TOF patients evaluated from September 2001 to June 2008.
Results
We report a prevalence of sustained, symptomatic AFL in patients with repaired TOF equal to 20% (28/140 patients), and of recurrent, drug-refractory and/or severely symptomatic AFL to be 11% (16/140 patients). The AFLs manifested variable cycle lengths ranging from 215 to 525 ms. Underlying mechanisms were: (1) cavotricuspid (CTI)-dependent, counterclockwise atrial flutter (n = 8 patients); (2) non-CTI-dependent macroreentrant scar-related AFL (n = 6 patients); and (3) both CTI- and non-CTI-dependent macroreentrant AFL (n = 2 patients). Recurrent arrhythmias occurred in six patients, five of whom were successfully treated with repeat ablation. After a mean follow-up of 23 months, 15 of 16 patients were alive and free of sustained AFL.
Conclusions
AFL late after surgical TOF repair occurs in 20% of such patients. In more than half of these patients, the AFLs are drug-refractory and/or severely symptomatic. Despite the presence of congenital heart disease treated with prior cardiac surgery and AFLs with variable atrial cycle lengths, the CTI-dependent mechanism underlies approximately half of the sustained, symptomatic AFLs.
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Abbreviations
- AFL:
-
Atrial flutter
- RA:
-
Right atrium
- EP:
-
Electrophysiological
- CTI:
-
Cavotricuspid isthmus
- TOF:
-
Tetralogy of Fallot
- RFA:
-
Radiofrequency ablation
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Acknowledgments
The authors would like to thank Ms. Cecille Garcia, N.P., for her assistance with data collection and Ms. AnnaMaria Arias for assistance with manuscript preparation.
Funding Sources
Funded in part by a grant from the New York State Empire Clinical Research Investigator Program (Dr. Biviano).
Disclosures
The authors report no conflicts related to this article.
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Biviano, atrial flutter in tetralogy of Fallot, and catheter ablation outcomes
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Biviano, A., Garan, H., Hickey, K. et al. Atrial flutter catheter ablation in adult patients with repaired tetralogy of Fallot: mechanisms and outcomes of percutaneous catheter ablation in a consecutive series. J Interv Card Electrophysiol 28, 125–135 (2010). https://doi.org/10.1007/s10840-010-9477-5
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DOI: https://doi.org/10.1007/s10840-010-9477-5