Effect Of Radiofrequency Ablation On Pulmonary Valve Function In Patients With Idiopathic Right Ventricular Outflow Tract Ventricular Arrhythmia

Background: Radiofrequency ablation at the right ventricular outflow tract and tissue around pulmonary valves has the potential risk of pulmonary regurgitation(PR).Objective: The purpose of this study was to explore the effect on the function of the pulmonary valves(PV)of radiofrequency catheter ablation applying in the right ventricular outflow tract(RVOT)and around the PV tissue for idiopathic ventricular arrhythmia derived from the RVOT.Methods: We studied 30 patients who received radiofrequency ablation with idiopathic ventricular arrhythmias originating from the RVOT,and divided them into two groups: ablating at RVOT(RVOT group,n=10)and ablating at tissue around PV(PV group,n=20).We conducted a prospective study.We applied echocardiography to evaluate the function of the pulmonary valves and right ventricular before ablation.During the operation,we recorded the ablation parameters and catheter operation methods.The echocardiography was used to evaluate pulmonary valves and right ventricular the second day.Results: Among the 30 cases of radiofrequency catheter ablation,there were 20 cases(66.7%)of PV ablation(PV group)and 10 cases(33.3%)of RVOT(RVOT group).The difference in pulmonary reflux width(△ PR)between the two groups after surgery and before surgery was statistically significant(1.42±1.19 mm VS 0.29±1.15 mm,P=0.019).Moreover,the PR width of patients in the PV group was compared with that before ablation and there was a significant difference(Before 1.53±1.20 mm surgery VS After2.95±0.71 mm,P<0.001).Regardless of before or after ablation,all PRs are mild and do not require medical intervention.Conclusions: Although ablation of RVOT,especially the pulmonary valves surroundings may cause PR,the degree of PR is relatively mild,and medical intervention is not required.