Clinical Research
Ablation index guided mitral isthmus radiofrequency ablation of persistent atrial fibrillation
Tao Hailong, Zhu Kui, Zhao Jiangtao, Chen Xiaowei, Dong Jianzeng
Published 2020-06-28
Cite as Chin J Cardiac Arrhyth, 2020, 24(3): 298-302. DOI: 10.3760/cma.j.cn.113859-20190924-00208
Abstract
ObjectiveTo explore the efficacy of ablation index (AI) for mitral isthmus (MI) radiofrequency ablation of persistent atrial fibrillation.
MethodFrom January 2018 to September 2018, eighty patients (including forty-eight in male) with persistent atrial fibrillation were undergone catheter ablation in the cardiology department of the First Affiliated Hospital of Zhengzhou University. They were randomly divided into AI guided group (Group A) and contact force guided group (Group B) for pulmonary vein (PVI) and extra liner ablation, including MI, roof line and cardiac tricuspid isthmus. We sought to compare the difference between two groups in acute PVI after cardioversion, the acute MI conduction block after cardioversion, final MI conduction block, MI ablation time, overall operation time, periprocedure complication and success rate in follow-up.
ResultsThere were no significant differences in clinical characteristics, with the average age of (60.4±10.3) years, range 32-75 years. The acute PVI after cardioversion (92.5% vs. 85.0%, P=0.32) and final MI conduction block (87.5% vs. 75.0%, P=0.12) were compatible in two groups. But in Group A, the acute MI conduction block after cardioversion was higher (55.0% vs. 17.5%, P<0.01) , the MI ablation time and overall operation time was shorter [ (15.1±3.2) min vs. (16.7±3.6) min,P=0.04; (127.1±4.7) min vs. (131.1±9.7) min, P=0.02] . No major periprocedure complications were observed. At the end of follow-up, the rate of freedom from atrial fibrillation was higher in group A than in group B (82.5% vs. 62.5%, P=0.045) .
ConclusionAI guided ablation for persistent atrial fibrillation can improve the efficacy of MI block, decrease operation time and increase the future success rate.
Key words:
Atrial fibrillation; Ablation index; Mitral isthmus; Radiofrequency ablation
Contributor Information
Tao Hailong
Cardiology Department of the First Affiliated Hospital of Zhengzhou University, 450052 Zhengzhou, China
Zhu Kui
Cardiology Department of the First Affiliated Hospital of Zhengzhou University, 450052 Zhengzhou, China
Zhao Jiangtao
Cardiology Department of the First Affiliated Hospital of Zhengzhou University, 450052 Zhengzhou, China
Chen Xiaowei
Cardiology Department of the First Affiliated Hospital of Zhengzhou University, 450052 Zhengzhou, China
Dong Jianzeng
Cardiology Department of the First Affiliated Hospital of Zhengzhou University, 450052 Zhengzhou, China