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Experimental Assessment on the Normal Myocardial Activation Origin and Contraction Sequence by Doppler Tissue Imaging

Ji Ruiping,Wang Xinfang,Li Zhian,et al Union Hospital,Tongji Medical University,Wuhan 430022  
Objective:To evaluate the possibility and accuracy of Doppler Tissue Imaging(DTI)on assessment of normal myocardial activation and contraction sequence.Methods:9 open chest dogs hearts were analysed by M modes,spectrum and acceleration mode DTI.Results:Acceleration mapping mode:the origin of activation and conduction sequences could be viewed.M mode DTI:the activation in mid interventricular septum was earlier than in mid left ventricular posterior wall;Spectrum DTI:the ventricular endocardial activation was earlier than the ventricular epicardium in all segments.The earliest site of activation of the ventricular wall was at mid interventricular septum,the latest site was at basal posterior wall,the contraction sequences were different at the different segments of the wall.Conclusion:DTI can localize normal myocardial activation origin and assess contraction sequence accurately.
【CateGory Index】: R540.45
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