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《Chinese Journal of Medical Imaging Technology》 2011-01
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Speckle tracking imaging in the evaluation of left ventricular mechanical changes in patients with myocardial ischemia

WEI Feng,LI Yu-hong(Department of Ultrasound,the First Affiliated Hospital of Liaoning Medical College,Jinzhou 121001,China)  
Objective To evaluate the application value of two-dimensional ultrasound speckle tracking imaging(STI) in assessing mechanical changes in patients with myocardial ischemia.Methods Seventy myocardial ischemia patients and 35 healthy volunteers underwent STI examination.Peak value of longitudinal,radial and circumferential strain(LS,RS and CS) of left ventricle,and the time to peak were obtained with 18-segment model and were compared.The peak basal and apical rotation of left ventricular minor axis and the time to peak were gathered,the peak value of left ventricular whole reverse angle and time to peak were calculated.Peak angular velocity of diastole early time at apex and bottom(A-vel and B-vel) were compared between the two groups.Results Compared with control group,peak value of LS,RS and CS decreased in each ischemia stage and time to peak obviously retarded,there were statistical significant differences except posterior wall(P0.05).The peak basal and apical rotation of left ventricular minor axis and the peak value of left ventricular whole reverse angle were all smaller than those of control group,and the time to peak retarded(all P0.05).The A-vel of myocardial ischemia patients was obviously lower than that of control group(P0.05),but the B-vel were not statistical different between two groups(P0.05).Conclusion STI can quantitatively detect mechanical changes of left ventricle in patients with myocardial ischemia and assess the partial function of cardiac muscles.
【CateGory Index】: R445.1
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