Evaluation of relationship between longitudinal and radial strains of left ventricular in patients with myocardial infarction by speckle tracking imaging

Objective To assess longitudinal strain(LS) and radial strain(RS) of left ventricular and their relationship in patients with myocardial infarction(MI) by speckle tracking imaging(STI). Methods Two-dimensional echocardiography(2DE) was performed to measure peak systolic LS and RS in 60 healthy subjects and 90 patients with MI by STI. 2DE images with high frame rate were recorded from the left ventricular short-axis views at the levels of mitral annulus, papillary muscle and apex,and from the apical two-, three- and four-chamber views. And LS was measured in the apical long-axis views and RS in the left ventricular short-axis views respectively by two-dimensional strain software. Results There were notably differences between normal and infarcted segments for peak systolic LS (P 0.05). Conclusions STI is able to quantitatively assess myocardial systolic function, and peak systolic LS and RS are equal in the indentification of the infarcted segments. Key words: Ecbocardiography;  Myocardial infarction;  Ventricular function, left;  Strain;  Speckle tracking imaging