Objective:To investigate the efficacy and safety of catheter radiofrequency ablation for focal atrial tachycardia

by comparing conventional mapping group and Carto system mapping group.Methods:50 patients with focal atrial tachycardia underwent electrophysiologic study and radiofrequency ablation.32 cases were in conventional mapping group

and 25 cases in Carto system mapping group

including 7 cases with unsuccessful ablation in conventional mapping group.During follow-up 20±11 months

radiofrequency ablation acute successful rate

long-term successful rate

safety

and the clinical symptoms were recorded.ⅹ-ray radiation exposure time was compared between conventional mapping group and Carto system mapping group.Results: ① radiofrequency ablation acute successful rate of conventional mapping group and Carto system mapping group were 78% and 100%

and long-term successful rate were 68% and 96% respectively.No complications occurred.The clinical symptoms caused by focal atrial tachycardia disappeared after successful ablation.② ⅹ-ray radiation exposure time of Carto system mapping group was shorter than that of conventional mapping group.Conclusions: Successful rate and safety of radiofrequency ablation of focal atrial tachycardia were higher

and effects of Carto system mapping group were better than those of conventional mapping group.And X-ray radiation exposure time of Carto system mapping group decreased.