Objective To explore the value of two-dimensional speckle tracking echocardiography（2 D-STE）inevaluating left ventricular systolic function and prognosis after percutaneous coronary intervention（PCI）for acute myocardialinfarction（AMI）.Methods A total of 84 patients with AMI who underwent emergency PCI in our hospital were selected.2 D-STE was performed 3 d

1 month

3 months and 6 months after surgery

the parameters of conventional echocardiography

thelongitudinal strain（LS）

radial strain（RS）

and circumferential strain（CS）of the myocardium were recorded.The correlationbetween D-value of strain（ΔLS

ΔRS

ΔCS）and ejection fraction（LVEF）were analyzed.According to the occurrence of adverseprognostic events

84 patients were divided into good prognosis group（n=51）and poor prognosis group（n=33）.The clinical andultrasonic examination results of two groups were compared

the multivariate Logistic regression analysis was used to analyze theadverse prognostic factors.The receiver operating characteristic（ROC）curve was drawn to evaluate the diagnostic efficacy of LS

RS

CS on the prognosis of AMI.Results The left ventricular end-diastolic diameter（LVDd）

left ventricular end-systolic diameter（LVDs）

left ventricular end-diastolic volume（LVEDV）

left ventricular end-systolic volume（LVESV）of AMI patientsat 1 month

3 months and 6 months after PCI were lower than those of postoperative 3 d（all P<0.05）

and LVEDV and LVESV at3 months and 6 months after PCI were lower than those at 1 month after PCI（all P<0.05）.LVEF increased gradually at differenttime points after PCI（all P<0.05）.The LS

RS and CS were increased gradually at different time points after PCI in AMI patients

the difference were statistically significant（all P<0.05）.The ΔLS

ΔRS

ΔCS in AMI patients at 3 d

1 month

3 months

and6 months after PCT were positively correlated with LVEF（all P<0.05）.There were statistically significant differences betweenthe good prognosis group and the poor prognosis group in the range of coronary lesions

LVEDV

LVESV

LVEF

LS

RS

CS（all P<0.05）.Multivariate Logistic regression analysis showed that the range of coronary lesions

LVEF

LS

RS and CS wereall independent factors affecting the prognosis of patients（all P<0.05）.Area under the curve for AMI prognosis assessed byLS

RS

and CS were 0.746（95%CI:0.642～0.851）

0.691（95%CI:0.578～0.804）

0.729（95%CI:0.621～0.839）

respectively.Conclusion 2 D-STE can objectively reflect the changes of left ventricular systolic function in patients with AMI after PCI

andcan provide an important basis for patient prognosis evaluation

which has good clinical application value.