Europace Advance Access originally published online on June 1, 2007
Europace 2007 9(9):785-789; doi:10.1093/europace/eum105
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CATHETER ABLATION
Inducible supraventricular tachycardias in patients referred for catheter ablation of atrial fibrillation
1 Department of Cardiology, Athens Euroclinic, 9 Athanassiadou Street, Athens 11521, Greece; 2 Division of Cardiology, Medical College of Virginia, Richmond, VA, USA
Aims To investigate the prevalence of underlying, inducible supraventricular arrhythmias in patients referred for ablation of atrial fibrillation (AF).
Methods and results Electrophysiology study reports of 409 consecutive patients (18% female), aged 55 ± 9 years, who were referred for catheter ablation of AF, were studied. At electrophysiology study, arrhythmias other than AF were induced in 31 patients (7.6%). Cavotricuspid-dependent atrial flutter was induced in 15 patients (3.7%), slow-fast atrioventricular nodal re-entrant tachycardia (AVNRT) in seven patients (1.7%), atrioventricular re-entrant tachycardia (AVRT) due to an accessory pathway in five patients (1.2%), and atrial tachycardia (AT) in four patients (0.98%). Specific ablation aimed at elimination of the underlying arrhythmia only was performed in 13 patients, isolation of the pulmonary veins without additional ablation in three patients, and a combined procedure was performed in the remaining 15 patients. No significant association was observed between type of induced arrhythmia and type of ablation performed (P = 0.338). Slow pathway ablation without pulmonary vein isolation was more common among patients with AVNRT (five patients, 71%). AF recurrence was higher among patients in whom atrial flutter was induced at electrophysiology study (eight patients, 53%) compared to those with AVRT (no patient), AT (no patient), or AVNRT (one patient) (P = 0.03).
Conclusion Patients referred for ablation of paroxysmal AF should be investigated for evidence of underlying supraventricular arrhytmias. In patients with AVNRT, slow pathway ablation may be the only procedure that is necessary for cure of AF. Inducibility of atrial flutter appears to carry an increased risk of AF recurrence regardless of whether the cavotricuspid isthmus is also ablated.
Key Words: Atrial fibrillation, Supraventricular tachycardia, Radiofrequency ablation
* Corresponding author. Tel: +30 210 6416600; fax: +30 210 6416661. E-mail address: dkatritsis{at}euroclinic.gr/ dgkatr{at}otenet.gr
Manuscript submitted 15 February 2007. Accepted after revision 24 April 2007.
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