Measurements of two dimensional circumferetial strain in healthy subjects by echocardiography speckle tracking imaging

Objective To evaluate left ventricular systolic circumferental strain(CS)by echocardiography speckle tracking in health subjects.Methods 50 healthy subjects(male 20,female 30)with mean age of(41.1±20.1)years old were studied.Two-dimensional(2D)images of three consecutive cardiac cycles were recorded from left ventricular short-axis views at the levels of mitral annulus,papillary muscle and apex.2D images were transferred to Qlab8 and One workstation for offline strain analysis.The peak systolic of CS was measured in the left ventricular short-axis views from 18 standard segments in the inner and outer layers of myocardium using two-dimensional strain software.Results The CS values of the inner layers showed higher than those of the outer layers at 18 segments(P0.05).In the same level,the CS values of anteroseptal and posterior segment showed higher than those of the other segment(P0.01).Conclusion Speckle tracking imaging technique is independent of insonation angle for assessing myocardial strain,illustrates a difference in CS between the inner and outer layers,it has the potency to be used clinically in evaluation of LV regional myocardial systolic function is a new method of in diagnosis of cardiac diseases.