Two-dimensional Speckle Tracking Technology Combining With Exercise Test In Healthy Subjects Research Myocardial Rotations During Isochoric Systolic

Objective:Using two-dimensional speckle tracking technology research both sub-endocardial and sub-epicardial layers rotation in left ventricular apex and base level within different phase of test,depict feature of its change. Demonstration the value of sub-endocardial and sub-epicardial rotation in left ventricular apex or basal levels during isochoric systolic reflect left ventricular function.Methods:40cases of healthy college students in school, two-dimensional speckle tracking technology was used to measure twist of both sub-endocardial and sub-epicardial in left ventricular,rotation of both sub-endocardial and sub-epicardial in apex and basal levels of left ventricular in based state, exercise load state and recovery state during isochoric systolic,at the same time get heart function parameters,such as:Left ventricular ejection fraction,heart rate blood pressure double product, index of cardiac reserve, mitral peak early diastolic blood flow velocity and the left ventricular lateral wall of mitral annulus peak early diastolic velocity ratio,then analysis correlation of twist of both sub-endocardial and sub-epicardial in left ventricular,rotation of both sub-endocardial and sub-epicardial in apex and basal levels of left ventricular between cardiac function parameters.Result:1â‘ Both sub-endocardial and sub-epicardial in apex levels of left ventricular rotate like counterclockwise in isochoric systolic,then turn clockwise, the ejection final increase up to peak, decrease in the final diastolic;Both sub-endocardial and sub-epicardial in base levels of left ventricular rotate like clockwise in isovolumetric diastolic period,then counter-clockwise increased and counter-clockwise decreases in end-diastolic phase.â‘¡Twist of sub-endocardial and sub-epicardial layers,rotation of sub-endocardial and and sub-epicardial layers in apex level in state of foundation, load and recovery difference was statistically significant;Rotations of both sub-endocardial and sub-epicardial layers was no statistically significant difference in each state.2Rotation of sub-epicardial in apex levels of left ventricular positively related to LVEF, E/e, RPP, negatively related to index of cardiac reserve.Rotation of sub-endocardial layers in apex levels of left ventricular positively related to E/e, RPP, with no related to LVEF and the index of cardiac reserve.Twist of sub-epicardial layers of left ventricular positively related to E/e, RPP, positively related to index of cardiac reserve,twist of sub-epicardial layers of left ventricular positively related to E/e, RPP;There was no relation with cardiac function parameters and rotations of both sub-endocardial and sub-epicardial layers in base levels of left ventricular.Conclusion:1.Twist of both sub-endocardial and sub-epicardial,rotation of both sub-endocardial and sub-epicardial in apex and basal levels of left ventricular change law conforms to physiological changes in every exercise load text.2.Rotation of sub-epicardial in apex levels of left ventricular was related to cardiac function parameters,have ability which was qualified to index that reflect the left ventricular systolic function, diastolic function and myocardial reserve and the left ventricular cardiac work process.