Electroanatomical systems guided circumferential pulmonary veins ablation with single Lasso for atrial fibrillation

Objective To assess the safety and effect of electroanatomical systems (Carto) guided circumferential pulmonary veins ablation for atrial fibrillation (AF).Methods Four patients with AF, one with paroxysmal atrial flutter, were studied.The mean age was (52±10) years. Three were male and one female. The mean AF duration was(3.3±1.8)years. Electroanatomical mapping was integrated with pre-acquired CT to guide catheter ablation. A 3D electroanatomical map of the left atrium including the pulmonary veins ostia was constructed with a nonfluoroscopic navigation system (Carto, Biosense Webster).All patients underwent circumferential pulmonary vein ablation. Cardioversion was done by means of drugs (Propafenone) or electrical shocks if AF persisted after ablation. Oral anticoagulant therapy lasted for 2 months after the procedure. Patients were followed up for 4-12 months.Results All patients with AF were AF-free. The radiofrequency ablation time was (6±43) min and the exposure time was (48±7) min. No serious complication or recurrence was found during the follow-up.Conclusion Carto systems united with single Lasso can be effective and safe in the guidance of the ablation for AF.Comparing with conventional approach, it reduces X-ray exposure and the cost.