摘要目的 应用斑点追踪显像(STI)技术评价急性心肌梗死患者经皮冠状动脉介入治疗(PCI)前、后左室心肌运动的同步性.方法 急性心肌梗死患者30例,分别于PCI术前、术后5d及术后1个月行超声心动图检查,记录并存储心尖3个长轴切面和左室系列短轴切面图像.测量收缩期及舒张早期纵向应变率的达峰时间(TS-SRL,TE-SRL)及径向应变率的达峰时间(TS-SRR,TE-SRR),计算各节段收缩期及舒张早期应变率达峰时间的最大值与最小值之差和标准差,比较PCI前、后各参数的变化情况.结果 与术前及术后5d比较,术后1个月纵向应变率收缩期达峰时间最大值与最小值之差(TSL-diff)和标准差(TSL-SD)及纵向应变率舒张早期达峰时间的最大值与最小值之差(TEL-diff)和标准差(TEL-SD)均明显缩短,差异具有统计学意义(P＜0.01)；径向应变率收缩期达峰时间最大值与最小值之差(TSR-diff)和标准差(TSR-SD)及径向应变率舒张早期达峰时间最大值与最小值之差(TER-diff)和标准差(TER-SD)亦显著缩短,差异具有统计学意义(P＜0.01);心脏不同步性指数与左室射血分数呈良好的负相关性.结论 急性心肌梗死患者存在着左室收缩和舒张同步性的异常,STI技术对评价左心室同步性和介入治疗后变化具有重要的临床意义.

abstractsObjective To evaluate the changes of ventricular synchrony in patients with acute myocardial infarction(AMI)before and after percutaneous coronary intervention(PCI)by speckle tracking imaging(STI).Methods Thirty patients with AMI were examined by traditional echocardiography and STI before and 5 d,1 month after PCI.Myocardial imaging of left ventricular apical long views and parasternal left ventricular short axis views were recorded and stored.The time to peak longitudinal systolic and diastolic strain rate(TS-SRL,TE-SRL)and to peak radial systolic and diastolic strain rate(TS-SRR,TESRR)were measured respectively.The differences of the maximum and minimum systolic and early diastolic peak time(TSL-diff,TER-diff)and the standard deviation(TSL-SD,TER-SD)in 18 longitudinal segments were calculated.And the differences and standard deviation of TS-SRR and TE-SRR(TSR-diff,TSR-SD,TER-diff,TER-SD)were calculated also.These parameters were compared before and after PCI.Results Compared with before and 5 d after PCI,the values of TSL-diff,TSL-SD,TEL-diff and TEL-SD in 1 month after PCI were decreased significantly(P＜0.01).TSR-diff,TSR-SD,TER-diff and TER-SD were decreased also and the differences had statistical significance(P＜0.01).The cardiac synchronized index and LVEF values showed good negative correlation.Conclusions The systolic and diastolic synchrony of left ventricle in AMI patients was abnormal.STI can evaluate left ventricular synchronized function and the changes before and after PCI to assess the effect of PCI.