Conclusions
All in all, LV function is closely related to the stenosis degree of TVD. In the early stage of TVD, when the overall left ventricular systolic function is normal, the local left ventricular systolic function has been damaged. As a new technique, 3D-STE can detect the changes of myocardial function earlier in patients with TVD 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.