Clinical trial NCT00408200
Conditions: Atrial Fibrillation
Keywords: Atrial fibrillation Atrial arrhythmia
Sponsor: University of Pennsylvania
Start date: 2006-11-01; Completion date: 2008-06-01
Enrollment: 110 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
The purpose of this study is to examine the overall effectiveness of anti-arrhythmic medicines (to control heart rhythm) prescribed after an ablation procedure for atrial fibrillation.

Detailed description:
Atrial fibrillation (AF) is the most common heart rhythm disorder in the US and it is associated with shortness of breath, palpitations, stroke occurrence and increased mortality. Traditional treatment for AF includes anticoagulation, drugs that slow the heart rate and antiarrhythmic agents. More recently, catheter based treatments to address atrial fibrillation have been developed, which involves using radiofrequency energy to isolate the arrhythmogenic foci localized in the pulmonary veins.

During the first weeks following pulmonary vein isolation (PVI), it is not unusual for patients to experience early recurrences of atrial fibrillation or atrial tachycardia due to irritability from the ablation. While these arrhythmias tend to resolve over time, it is nevertheless standard practice to prescribe antiarrhythmic drugs for the first 2-3 months after the intervention to prevent these early recurrences. However, the efficacy of this practice has never been formally evaluated. In addition, we have identified a small group of patients whose atrial tachycardias have terminated after cessation of antiarrhythmic therapy, suggesting that proarrhythmia from these agents may promote reentrant tachycardias in some patients. We therefore designed a study protocol that will evaluate the usefulness of short term antiarrhythmic drug therapy in order to prevent atrial fibrillation and atrial tachycardia episodes during the first 6 weeks following PVI.

The target population of the study includes all patients with paroxysmal atrial fibrillation referred for PVI. After the ablation procedure, patients will be randomized to receive or not receive antiarrhythmic drugs for a period of 6 weeks. Arrhythmia occurrence during this period will be monitored via twice daily transtelephonic monitoring. Clinical visits including a physical exam and 12 lead ECG recording will be scheduled at 6 weeks. The primary endpoint of the study will be a composite endpoint including 1) atrial arrhythmias persisting \> 24 hours or requiring initiation of antiarrhythmic therapy 2) need for cardioversion/hospital admission 3) need for repeat ablation or 4) adverse outcome/intolerance of antiarrhythmic agent requiring drug cessation or change during the 6 week follow up period.

Arms: arm 1: Subjects receive membrane-active anti-arrhythmic medication after ablation. See intervention list below. arm 2: Subjects do not receive membrane-active anti-arrhythmic medications after ablation.
Interventions: intervention 1: propafenone; flecainide; sotalol; dofetilide intervention 2: Radiofrequency catheter ablation
Intervention descriptions: intervention 1: Above drugs prescribed per established guidelines for treatment of AF intervention 2: A special catheter that delivers radiofrequency (heat) energy is advanced into the heart and used to destroy small areas of heart tissue responsible for causing atrial fibrillation. All catheters / devices used in the study are FDA approved for human use and currently being used to perform the AF ablation procedure in the United Sates.

Protocol documents: