DALLAS - At 10 years after their procedures, the rate of freedom from atrial fibrillation and atrial tachycardia was 87% in 513 patients who underwent pulmonary vein antrum isolation for drug-refractory paroxysmal atrial fibrillation at a single high-volume center in Texas.
After a single radiofrequency ablation procedure, 59% of patients remained arrhythmia free for the full decade and another 28% of the cohort was rendered arrhythmia free after an average of two repeat ablation procedures, Dr. Pasquale Santangeli reported at the American Heart Association scientific sessions.
A particularly striking finding in this series was the low 4% rate of recurrent atrial arrhythmias during years 3-6 of follow-up, and the 5% rate between years 6 and 10. Those late recurrence rates are much lower than those in previous reports from other centers. The likely explanation lies in the fact that electrophysiologists at the Austin center routinely extended their pulmonary vein antrum isolation to the posterior wall and performed empiric isolation of the superior vena cava in all patients. Other centers reporting long-term outcomes generally performed segmental or less extensive antral isolation, observed Dr. Santangeli of the Texas Cardiac Arrhythmia Institute at St. David?s Medical Center in Austin, Tex., and the University of Foggia (Italy).
Follow-up, including Holter monitoring, was performed every 3 months during year 1 and every 6-9 months thereafter. The rate of recurrent atrial arrhythmia was 21% at 1 year and 11% during years 1-3.
All patients with a recurrence were offered a repeat procedure, and 74% of them underwent repeat ablation. Reconnection in the pulmonary vein antrum was found in 31% of patients at the time of their first repeat procedure and in no patients who underwent a second repeat ablation.
Patients with recurrent atrial arrhythmia after two failed procedures underwent a high-dose isoproterenol challenge to identify nonpulmonary vein triggers, which were then targeted for ablation. The predictors of very late recurrence due to nonpulmonary vein triggers were increased left atrial size, obesity, and female gender.
Dr. Santangeli reported having no financial conflicts in connection with this study, which was honored as the top presentation by an early career investigator in the core area of heart rhythm disorders and resuscitation science at the annual meeting.