应变率成像评价冠状动脉旁路移植术后左心功能变化

目的探讨超声应变率成像技术定量评估冠状动脉旁路移植术前后左心室收缩功能的价值。方法20例冠状动脉旁路移植术患者。分别于术前1天、术后2周、术后2个月测量前壁及前间隔的基底段、中段的应变率,分析它们的室壁运动,测量左室的射血分数EF。结果与术前相比,术后2周各节段心肌的应变率均有增加(P<0.05),术后2个月各节段心肌应变率射血分数明显增加(P<0.01)。术前平均射血分数为0.468±0.076,术后2周增加为0.517±0.059(P<0.05),术后2个月则增加为0.587±0.038(P<0.01)。结论应变率成像技术能定量评价冠状动脉旁路移植术前后左室壁局部心肌心功能的变化。

Study of the left ventricular function after coronary artery bypass grafting(CABG) by strain rate imaging

Objective To determine the value of the left ventricular functional change after CABG and to quantitively analyse regional left ventricular systolic function by strain rate imaging (SRI). Methods The base and mid ventricle strain rate of the sept and anterior wall were measured and their wall motions were analysed and EF was measured in 20 cases before and 2 weeks ,2 monthes after CABG.Results Compared with those of before CABG, the strain rates of 2 weeks after CABG were increased ( P < 0.05 ),2 monthes after CABG were significantly increased ( P < 0.01 ). 2 weeks after CABG patients had increased EF ( P < 0.05 ),2 monthes after CABG patients had significant increased EF ( P < 0.01 ). Conclusion Strain rate imaging can quantitively analyse the left ventricular regional myocardial functional changes.