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Clinical outcomes of catheter substrate ablation for high-risk patients with atrial fibrillation.

Abstract：

OBJECTIVES:The purpose of this study was to determine the long-term clinical outcomes of catheter ablation of atrial fibrillation (AF) substrate for high-risk patients with AF. BACKGROUND:The benefits of catheter ablation for high-risk AF patients with respect to mortality and stroke reductions remain unclear. METHODS:We performed AF substrate ablation guided by complex fractionated atrial electrogram (CFAE) mapping in 674 high-risk AF patients. The clinical end points were sinus rhythm (SR), death, stroke, or bleeding. Of these 674 patients, 635 were available for follow-up and made up the study cohort. The patients were relatively old (mean age 67 +/- 12 years) and 129 had an ejection fraction (EF) <40%. RESULTS:After the mean follow-up period of 836 +/- 605 days, 517 were in SR (81.4%). There were 15 deaths among the patients who stayed in SR compared with 14 deaths among those who remained in AF (5-year survival rate, 92% vs. 64%, respectively; p < 0.0001). SR was the most important independent favorable parameter for survival (hazard ratio 0.14, 95% confidence interval 0.06 to 0.36, p < 0.0001), whereas old age was unfavorable. Warfarin therapy was discontinued in 434 of the 517 patients in SR post-ablation (84%) whose annual stroke rate was only 0.4% compared with 2% in those with continuing warfarin treatment (p = 0.004). CONCLUSIONS:CFAE-targeted ablation of AF is effective in maintaining SR in selected high-risk AF patients and might allow patients to stop warfarin therapy. SR after AF ablation is a marker of relatively low mortality and stroke risk. Our findings support conducting further randomized studies to determine whether AF ablation is associated with mortality and/or stroke reduction.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Nademanee K,Schwab MC,Kosar EM,Karwecki M,Moran MD,Visessook N,Michael AD,Ngarmukos T

doi

10.1016/j.jacc.2007.10.044

subject

Has Abstract

pub_date

2008-02-26 00:00:00

pages

843-9

issue

8

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(07)03783-7

journal_volume

51

pub_type

杂志文章

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