Abstract: Objective  To compare the catheter radiofrequency ablation for idiopathic ventricular arrhythmia guided  by Carto3 system with or without fluoroscopy,  so as to evaluate the efficacy and safety of zero fluoroscopy approach.Methods  A prospective study was performed among 106 consecutive patients of idiopathic ventricular arrhythmia (IVA,  including idiopathic premature ventricular contraction and idiopathic ventricular tachycardia) who were hospitalized from January 2017 to March 2018 in the First Affiliated Hospital of Guangxi Medical University. The catheter radiofrequency ablation was performed under Carto3 system guidance.According to the date of operation,  patients were randomly divided into two groups. Of them,  39 cases operated on odd numbers were included zero fluoroscopy group (ZF group),  and 67 cases on double numbers were included in fluoroscopy group (F group). All the procedures were performed with contact force catheter of Biosense Webster  by 2 operators. The difference between the two groups in terms of their procedure time,  first mapping time,  number of ablation,  ablation time, fluoroscopy time, target position, immediate success rate, complications and recurrence rate were compared.Results  There was no statistical difference in baseline data such as age, sex,  disease course  and echocardiographic index between the two groups. ZF group was performed completely without fluoroscopy, and the fluoroscopy time of F group was 168.0(44.8,541.3) s. In terms of general procedure data such as the procedure time, first mapping time, number of ablation, ablation time, target position, no statistical difference was found between the two groups. As to the effectiveness and safety of the operation between the two groups, the immediate success rate, complications  and recurrence rate had no statistical difference（P＞0.05）.Conclusion  Catheter radiofrequency ablation for idiopathic ventricular arrhythmias guided by Carto3 system without fluoroscopy showed efficacy and safety, without increasing  the procedure time, the first mapping time,  and the number of ablation.

Key words: arrhythmias, cardiac, catheter ablation , X-rays