Left Ventricular Activation Imaging by 3-Dimensional Speckle-Tracking Echocardiography:– Comparison With Electrical Activation Mapping –
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概要
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Background: Activation imaging with 3-dimensional speckle-tracking echocardiography (3D-STE) aims to visualize the time required for the onset of regional contraction from QRS onset. We hypothesized that the optimal setting of activation imaging was associated with electrical activation. This study was designed to determine an optimal setting of activation imaging with 3D-STE in comparison with that of a voltage mapping system and to assess the feasibility of this imaging method. Methods and Results: We enrolled 7 patients who underwent electrical voltage mapping. Regional deformation was measured by area change ratio (ACR) with 3D-STE. Activation imaging data were obtained at 10%, 25%, 50%, and 100% of maximal ACR values as the threshold for onset of regional contraction. Duration of LV electrical intraventricular activation time (IVATelectrical) by voltage mapping and mechanical IVAT (IVATmechanical) by activation imaging was defined as the time difference between the first and latest endocardial activation sites. We obtained 21 data sets under various conduction patterns and pacing configurations. The strongest correlation between IVATmechanical and IVATelectrical was observed at 25% of maximal ACR values (IVATelectrical=0.47 * IVATmechanical+20, R=0.80, P<0.001). Concordance of the first and latest activated segments between activation imaging and voltage mapping was 90.5% at this setting (19 studies). Conclusions: Activation imaging with 3D-STE may be a feasible noninvasive method of dyssynchrony imaging based on electromechanical coupling.
著者
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Kawamura Ryo
Cardiovacular Division, Graduate School of Comprehensive Human Sciences, University of Tsukuba
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Yamasaki Hiro
Cardiology Department Of Internal Medicine University Of Tsukuba Graduate School Of Comprehensive Hu
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Sekiguchi Yukio
Cardiology Department Of Internal Medicine University Of Tsukuba Graduate School Of Comprehensive Hu
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Ishizu Tomoko
Cardiovascular Division Graduate School Of Comprehensive Human Sciences University Of Tsukuba
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Aonuma Kazutaka
Cardiology Department Of Internal Medicine University Of Tsukuba Graduate School Of Comprehensive Hu
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Seo Yoshihiro
Cardiovascular Division Graduate School Of Comprehensive Human Sciences University Of Tsukuba
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Tada Hiroshi
Department Of Cardiology Osaka University
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Igarashi Miyako
Cardiovascular Division, Faculty of Medicine, University of Tsukuba
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