Prognostic Value of Speckle Tracking Echocardiography in Patients with ST-Elevation Myocardial Infarction Treated with Late Percutaneous Intervention

BackgroundLeft ventricular remodeling (LVr) is common after ST-segment elevation myocardial infarction (STEMI). The aim of this study was to evaluate the prognostic value of speckle tracking echocardiography (STE) for predicting LVr 6-9months after late percutaneous coronary intervention (PCI) in patients with STEMI. MethodsPatients with first STEMI who accepted late PCI were enrolled. Echocardiography was performed within 48hours of admission. Six to nine months after MI, an echocardiography examination was repeated. LVr was defined as >15% increase in LV end-systolic volume (LVESV) after 6months. ResultsOne hundred and twenty-seven patients were divided into two groups: 86 patients without LVr and 41 patients with LVr. There were significant differences in the global longitudinal strain (GLS), SD of time to peak longitudinal systolic strain (longitudinal Ts-SD), longitudinal postsystolic index, radial strain (RS), and SD of time to peak radial systolic strain (Radial Ts-SD). In multivariate logistic regression analysis, the GLS(odds ratio [OR]=0.39, 95% confidence interval [CI]=0.26-0.57, P<0.01), and RS(OR=1.07, 95% CI=1.02-1.13, P=0.01) were determinants of LVr. A receiver operating characteristic curve showed that the GLS predicted LVr with an optimal cutoff value of -10.85 (sensitivity: 89.7%, specificity: 91.7%). During clinical follow-up for 16.91.6months, death or congestive heart failure developed in 12 patients (9.4%), and the baseline ejection fraction (OR=1.91, 95% CI=1.18-3.1, P=0.009) and GLS (OR=0.56, 95% CI=0.34-0.91, P=0.02) were independent predictors. ConclusionIn patients with STEMI treated with late percutaneous coronary intervention, the GLS as measured by STE is a strong predictor of LVr and adverse events.