BACKGROUND The best method for performing atrial fibrillation (AF) ablation is still under debate. The importance of using a circular mapping (CM) catheter for assessing isolation of the pulmonary vein (PV) antrum on the outcome of the procedure has not been clearly established. OBJECTIVE The purpose of this study was to evaluate whether use of a CM catheter improves the arrhythmia-free proportion after circumferential pulmonary vein ablation (CPVA). METHODS A series of 146 consecutive patients (83% males, age 53 ± 10 years, 53% paroxysmal AF) were randomized to two ablation strategies. In both groups, ipsilateral PV encirclement was performed until disappearance or dissociation of the local electrogram within the surrounded area. In the first group, only the radiofrequency catheter was used to both map and ablate (CPVA group, n = 73). In the other group, a CM catheter was added to assess the electrical activity of the PV antrum (CPVA-CM group, n = 73). An ablation line along the left atrial roof was also created in all patients. RESULTS Procedural and fluoroscopic times were longer in the CPVA-CM group (P =.05). Severe procedure-related complications occurred in 1 (1.4%) patient in the CPVA group and in 3 (4.1%) patients in the CPVA-CM group (P = .317). After mean follow-up of 9 ± 3 months, 31 (42.5%) patients in the CPVA group and 47 (64.4%) patients in the CPVA-CM group were arrhythmia-free without antiarrhythmic medication (P = .008). CONCLUSION Use of a CM catheter to ensure isolation of the PV antrum improved the success of CPVA but increased some procedural requirements.
- Atrial fibrillation
- Pulmonary vein
- Radiofrequency catheter ablation