Correlation Between Left Ventricular Global Strain Measured by Speckle Tracking Echocardiography and Scar Burden Measured by Cardiac Magnetic Resonance Imaging in Patients With Ischemic Heart Disease

Evaluation of presence, localization, and extent of left ventricular(LV) scar tissue in patients with ischaemic heart disease (IHD) is of fundamental importance in clinical practice. It affects the decision making regarding revascularization and is a determinant of subsequent mortality. (Mele, Fiorencis et al. 2016) Late gadolinium contrast-enhanced cardiac magnetic resonance (LGE-CMR) is considered the current gold standard technique for assessment of the scar burden in IHD patients. However, it is not readily accessible in many areas due to availability and cost issues.(Abou, Prihadi et al. 2020), (Bendary, Afifi et al. 2019) Several recent studies suggested 2-D speckle tracking strain as a potential surrogate for cardiovascular magnetic resonance (CMR) late gadolinium enhancement (LGE) imaging. This would be useful in cases where CMR is not available, gadolinium contrast is contraindicated, or in patients at greater risk of adverse long term events. (Erley, Genovese et al. 2019) Among echocardiography derived strain measurements, global longitudinal strain (GLS) was shown to be superior to global circumferential strain (GCS) in its ability to detect subtle myocardial abnormalities due to better reproducibility (Erley et al, 2019). Left ventricular mechanical dispersion (LVMD) is also considered a valuable parameter that was associated with outcomes after myocardial infarction. (Abou, Prihadi et al. 2020). Despite the growing number of strain related studies in the literature, it is not clear whether the relationship of strain measurements with LGE is strong enough for strain to be considered as a surrogate. (Erley, Genovese et al. 2019). Also, the differences between GLS and LV MD among strain components in this context are not well established.