应变率成像对冠心病冠状动脉搭桥手术前后左心室局部收缩功能的评价

目的采用应变率成像（SRI）定量评价冠状动脉搭桥（CABG）手术前、后左室局部心肌功能变化，判断手术疗效，比较二维超声目测法和SRI参数法对冠心病局部室壁运动异常的诊断价值。方法病例组（20例冠心病患者）分别于CABG术前1d、术后10d、1个月、3个月及6个月测量冠状动脉左前降支参与供血的9个室壁节段的收缩期应变率（SRs）。术前与对照组比较，确定异常节段。比较以上异常节段术前、术后各时间点间的SRs变化情况。结果对照组SRs表现为一个宽大的负向波，且各节段均一分布；病例组SRs峰值减低，各节段均一分布的规律消失CABG术后1个月开始左前降支搭桥节段心肌SRs不同程度增大，前壁基底段、前间隔中间段和后间隔中间段各时间点之间差异有统计学意义（P〈0．05），6个月增大最明显。SRI参数法诊断室壁运动异常的敏感性高于传统的二维超声目测法。结论SRI可定量评价左室壁局部收缩功能，动态观察CABG手术前、后局部心肌功能的变化，判定术后疗效。

Evaluation of left ventricular regional systolic function before and after coronary artery bypass graft in patients with coronary artery disease using strain rate imaging

Objective To evaluate left ventricular regional systolic myocardial function quantitatively before and after coronary artery bypass graft(CABG) in patients with coronary artery disease(CAD) by strain rate imaging(SRI),and determine the effect of CABG.The diagnostic value of two-dimensional echocardiography(2-DE) method and SRI parameter method was compared.Methods The values of systolic strain rate(SRs) at 9 segments supplied by left anteior descending were measured in study group(20 patients with CAD) at 1 d before and 10 d,1 month,3 months and 6 months after CABG.The regional myocardial function befose CABG was analyzed and compared with that of controls,and abnormal segments were found.Then the values of these abnormal segments before and after CABG were compared.Results In control group,SRs displayed a wide and negative peak and was homogeneous in every segments.The SRs peak values decreased,and the homogeneity disappeared in study group.Beginning from 1 month after CABG,the SRs peak values at the graft segments increased in varying degrees,and there was significant difference at basal segments of anterior wall,middle segments of anteroseptal,and middle segments of posteroseptal in the different periods(P< 0.05 ).The change was most obvious in 6 months.The diagnosis sensitivity of SRI parameter method was higher than that of 2-DE.Conclusions SRI can evaluate the regional myocardial function quantitatively and monitor the improvement of myocardial function after CABG and determine the effect.