Résumé
Objective To quantitatively analyze myocardial function and the degree of myocardial ischemia with strain rate imaging (SRI). Methods SRI was performed in 34 patients with left anterior descending coronary artery disease diagnosed with coronary angiography and compared with 35 healthy volunteers. Isovolumic relaxation strain rates (SRivr) of anterior wall and anterior septal were measured. Results There was no significant cut-off value for LAD＜50%. A cut-off value of SRivr=-0.42 s~(-1) (sensitivity 84.85%, specificity 80.36%) for LAD 50%-74% stenosis. A cut-off value of SRivr=-0.91 s-1 (sensitivity 91.07%, specificity 89.91%) for LAD＞75% stenosis. Conclusion SRivr can quantitatively differentiate LAD 50%-74% or LAD＞75% stenosis. SRI can evaluate the coronary stenosis extent quantitatively.