Measurements of short axis systolic radial strain of left ventricle by using speckle tracking imaging in healthy subjects

Objective To evaluate left ventricular(LV)systolic radial strain(RS)by echocardiography Speckle Tracking imaging(STI)in health subjects.Methods It was obtained high frame rate two-dimensional images by echocardiography device for 50 healthy subjects and analysis based on Qlab8.1 work station.The system automatically divided three level myocardium(mitral valve,papillary muscles and apex)of LV short-axis into subendocadium,subepicadium and whole wall for the region of interest,and then the peak values of systolic RS in the region of interest were measured by two-dimensional ultrasound STI.Results The radial strain of the left ventricular short-axis of the inner layers showed higher than those of the outer layers in healthy subjects(P0.05).The peak systolic radial strain of the subendocadium of the left ventricular short-axis views in healthy subjects was the levels of last apexand apex.The peak systolic radial strain of the left ventricular short-axis views in health subjects were the level of papillary muscle mitri annulusapexand apex.The peak systolic radial strain of the subendocadium of different left ventricular short-axis views had no statistical difference.Conclusion Ultrasound STI is independent of insonation angle for assessing myocardial RS.It is of the potential to be used clinically in evaluation of LV regional and whole myocardial systolic function is a new method in diagnosing myocardial diseases.