Validity of resting strain/strain rate in prediction of myocardial viability

Abstract

To evaluate the validity of the resting strain/strain rate measurements in predicting myocardial viability taking delayed enhancement cardiac magnetic resonance imaging as the gold standard. Methods: A cohort of 60 patients at three months followed up after acute myocardial infarction were recruited for this study. Resting echocardiography with o ine analysis of deformation indices and gadolinium contrast enhanced cardiac magnetic resonance imaging were applied for all patients. ResultsFor the nal assessment, 268 segments with signi cant resting wall motion abnormalities were presented. Resting longitudinal strain was signi cantly (p<0.05) higher in viable, compared with nonviable segments in all the studied individual myocardial segments (apical inferior, mid antro-lateral, midinferolateral, mid infero-septum, and all other segments). Likewise, resting longitudinal strain rate was signi cantly (p<0.05) higher in viable, compared with non-viable segments in almost all studied individual myocardial segments apart from apical inferior, mid inferolateral and basal antro-septum (p=0.245, p=0.098, p=0.097 respectively). ConclusionResting Strain and Resting Strain rate could be used as accurate predictors of myocardia viability following acute myocardial infarction.

Speckle-tracking echocardiography for predicting improvement of myocardial contractile function after revascularization: a meta-analysis of prospective trials

“…Previous studies found global longitudinal strain of 11.3% or 13.7% as the best cut-off value for predicting improvement of global left ventricle function (≥ 5% increase in ejection fraction) after acute myocardial infarction [ 34 ]. Regarding regional longitudinal strain, studies have found variable cut-off values from 4.5% in chronic ischemic cardiomyopathy to 13.5% after acute myocardial infarction to identify non-viable myocardium based on gadolinium late enhancement [ 35 , 36 ]. In our meta-analysis it was not possible to define exact cut-off values for regional strain to predict functional improvement, but average values in viable and non-viable regions in different studies are shown in Tables 1 and 2 .…”