Published Online
on August 21, 2006

A more recent version of this article appeared on August 29, 2006

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Submitted on April 19, 2006
Revised on June 30, 2006
Accepted on July 6, 2006

Selective Atrial Vagal Denervation Guided by Evoked Vagal Reflex to Treat Patients With Paroxysmal Atrial Fibrillation

Mauricio Scanavacca MD, PhD^*, Cristiano F. Pisani MD, Denise Hachul MD, PhD, Sissy Lara MD, PhD, Carina Hardy MD, Francisco Darrieux MD, PhD, Ivani Trombetta PhD, Carlos Eduardo Negrão PhD, and Eduardo Sosa MD, PhD

From the Heart Institute, University of São Paulo Medical School, São Paulo, Brazil.

^* To whom correspondence should be addressed. E-mail: mauricio.scanavacca{at}incor.usp.br.

Background--The aim of this study was to evaluate whether selective radiofrequency (RF) catheter ablation of the atrial sites in which high-frequency stimulation induces vagal reflexes prevents paroxysmal atrial fibrillation (AF).

Methods and Results--Ten patients with episodes suggestive of vagal-induced paroxysmal AF and no heart disease were selected for percutaneous epicardial and endocardial mapping of the atria to search for sites in which high-frequency transcatheter stimulation (20 Hz,) induced vagal reflexes. A vagal response defined as AV block of >2 seconds was elicited in 7 of 10 patients (70%) with an average of 5±2.4 (range, 2 to 9) sites per patient, and RF pulses (21.0±12.0 per patient) were applied at those sites to eliminate all evoked vagal reflexes. The 3 patients in whom evoked vagal reflexes were not obtained underwent circumferential pulmonary vein ablation with an average of 58.0±13.9 RF pulses per patient (P=0.022). Autonomic evaluation was performed before and 48 hours and 3 months after the procedure and was consistent with vagal withdrawal in all patients. Two of the 7 patients who underwent denervation remained asymptomatic without the use of antiarrhythmic medication at a mean follow-up of 8.3±2.8 months (range, 5 to 15 months); 4 had frequent recurrences and were referred for circumferential pulmonary vein ablation; and 1 had few AF episodes without antiarrhythmic medication. The 3 patients without evoked vagal reflexes who underwent circumferential pulmonary vein ablation remained asymptomatic without antiarrhythmic medication. One patient had acute delayed gastric emptying after atrial vagal denervation.

Conclusions--RF catheter ablation of selected atrial sites in which high-frequency stimulation induced vagal reflexes may prevent AF recurrences in selected patients with apparently vagal-induced paroxysmal AF.

Key words: catheter ablation • fibrillation • nervous system, autonomic

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