Global longitudinal speckle-tracking strain is predictive of left ventricular remodeling after coronary angioplasty in patients with recent non-st elevation myocardial infarction

Abstract

AimsTo test whether two-dimensional longitudinal strain (2DSE) performed after revascularization by percutaneous coronary intervention (PCI) could predict left ventricular (LV) remodeling in patients with recent non-ST elevation myocardial infarction (NSTEMI). MethodsIn 70 patients (62.7±8.7years) with recent NSTEMI (between 72hours and 14days), undergoing coronary angiography for recurrent angina, myocardial deformation parameters were measured by 2DSE before and 24hours after reperfusion therapy. Strain in all LV segments was averaged to obtain a global value (Global longitudinal Strain – GLS). Infarct size was estimated by clinical parameters and cardiac markers. After 6months from intervention, LV negative remodeling was defined as lack of improvement of LV function, with increase in LV end-diastolic volume of greater than or equal than 15%. ResultsAt follow-up, patients were subdivided into remodeled (n=32) and non-remodeled (n=38) groups. Patients with negative LV remodeling had significantly lower baseline LV ejection fraction (44.8±6.9 vs. 48.7±5.5 %; p<0.05), higher peak troponin I (p<0.001) and reduced GLS (- 10.6±6.1 vs - 17.6±6.7 % p<0.001) than those without LV remodeling. GLS showed a close correlation with peak troponin I after PCI (r=0.64, P<0.0001) and LV WMSI (r=0.42, p<0.01). By multivariable analysis, diabetes mellitus (P<0.005), peak of Troponin I after PCI (P<0.0005), GLS at baseline (OR: 4.3; p<0.0001), and lack of improvement of GLS soon after PCI (OR: 1.45, P<0.01) were powerful independent predictors of negative LV remodelling at follow-up. In particular, a GLS≤12 % showed a sensitivity and a specificity respectively of 84.8% and 87.8% to predict negative LV remodelling at follow-up. Conclusionsin patients with recent NSTEMI, longitudinal LV global and regional speckle-tracking strain measurements are powerful independent predictors of LV remodeling after reperfusion therapy.