冠心病患者冠状动脉支架置入术前后局部心肌应变率的定量分析

目的 探讨心肌应变率显像（SRI）技术在评价冠心病患者冠状动脉支架置入术前后局部室壁运动状态中的应用价值。方法应用SRI技术对38例冠心病患者冠状动脉支架置入术前后心尖四腔、两腔观各节段局部心肌功能进行定量分析。结果术前缺血心肌应变率曲线中收缩期、舒张早期和舒张晚期SR峰值均小于正常节段并可出现收缩后收缩（PSS）波。术后经治疗的缺血心肌各峰值逐渐增加，PSS波消失，各指标较未经治疗的缺血心肌明显增加。结论SRI技术可准确识别缺血心肌节段，冠状动脉支架置入术可有效改善缺血心肌血供，提高心肌发生变形的能力。

Quantitative evaluation on coronary artery disease before and after intracoronary stent implantation by strain rate imaging

Objective To investigate the application of strain rate imaging(SRI) to estimate myocardial regional wall motion in coronary artery disease before and after intracoronary stent implantation. Methods Thirty-eight patients with coronary artery disease were studied at apical four-chamber view and two-chamber view before and after intracoronary stent implantation using SRI. Results Compared with normal myocardium, the peaks of strain rate curve at systole,early diastole and late diastole of ischemic myocardium all reduced,the postsystolic shortening(PSS) wave appeared before operation.Each peak of strain rate curve increased gradually and PSS wave disappeared after operation. Conclusions SRI can accurately differentiate abnormal perfusion segments from normal ones. Intracoronary stent implantation can significantly improve the blood supply to the ischemia myocardium and recover the function of myocardial deformation.