Conclusions
All in all, LV function is closely related to the degree of coronary artery stenosis. If there is no timely intervention in the early stage of myocardial ischemia, the LV function will further deteriorate. As a new technique, 3D-STE can detect the changes of myocardial function earlier in patients with TVD without myocardial infarction, and quantitatively evaluate the global LV function through multiple global strain parameters. This may provide a more effective method for monitoring the change of LV systolic strain and evaluating LV systolic function of TVD without myocardial infarction.