Detection and Quantification of Left Atrial Structural Remodeling With Delayed-Enhancement Magnetic Resonance Imaging in Patients With Atrial Fibrillation

被引:853
|
作者
Oakes, Robert S. [2 ]
Badger, Troy J.
Kholmovski, Eugene G. [3 ]
Akoum, Nazem
Burgon, Nathan S.
Fish, Eric N.
Blauer, Joshua J. E. [2 ]
Rao, Swati N.
DiBella, Edward V. R. [3 ]
Segerson, Nathan M.
Daccarett, Marcos
Windfelder, Jessiciah
McGann, Christopher J. [3 ]
Parker, Dennis [3 ]
MacLeod, Rob S. [2 ]
Marrouche, Nassir F. [1 ]
机构
[1] Univ Utah, Hlth Sci Ctr, Atrial Fibrillat Program, Div Cardiol,Sch Med, Salt Lake City, UT 84132 USA
[2] Univ Utah, Inst Comp Sci, Salt Lake City, UT 84132 USA
[3] Univ Utah, Utah Ctr Adv Imaging Res, Salt Lake City, UT 84132 USA
基金
美国国家卫生研究院;
关键词
atrial fibrillation; catheter ablation; imaging; remodeling; VEIN ANTRUM ISOLATION; QUANTITATIVE MYOCARDIAL-INFARCTION; AUTOMATED FEATURE ANALYSIS; PULMONARY-VEIN; HEART-FAILURE; CATHETER ABLATION; SIZING ALGORITHM; FIBROSIS; TISSUE; MODEL;
D O I
10.1161/CIRCULATIONAHA.108.811877
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background-Atrial fibrillation (AF) is associated with diffuse left atrial fibrosis and a reduction in endocardial voltage. These changes are indicators of AF severity and appear to be predictors of treatment outcome. In this study, we report the utility of delayed-enhancement magnetic resonance imaging (DE-MRI) in detecting abnormal atrial tissue before radiofrequency ablation and in predicting procedural outcome. Methods and Results-Eighty-one patients presenting for pulmonary vein antrum isolation for treatment of AF underwent 3-dimensional DE-MRI of the left atrium before the ablation. Six healthy volunteers also were scanned. DE-MRI images were manually segmented to isolate the left atrium, and custom software was implemented to quantify the spatial extent of delayed enhancement, which was then compared with the regions of low voltage from electroanatomic maps from the pulmonary vein antrum isolation procedure. Patients were assessed for AF recurrence at least 6 months after pulmonary vein antrum isolation, with an average follow-up of 9.6 +/- 3.7 months (range, 6 to 19 months). On the basis of the extent of preablation enhancement, 43 patients were classified as having minimal enhancement (average enhancement, 8.0 +/- 4.2%), 30 as having moderate enhancement (21.3 +/- 5.8%), and 8 as having extensive enhancement (50.1 +/- 15.4%). The rate of AF recurrence was 6 patients (14.0%) with minimal enhancement, 13 (43.3%) with moderate enhancement, and 6 (75%) with extensive enhancement (P < 0.001). Conclusions-DE-MRI provides a noninvasive means of assessing left atrial myocardial tissue in patients suffering from AF and might provide insight into the progress of the disease. Preablation DE-MRI holds promise for predicting responders to AF ablation and may provide a metric of overall disease progression. (Circulation. 2009; 119: 1758-1767.)
引用
收藏
页码:1758 / U123
页数:22
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