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Background Reduction of post-contrast T1 in remote normal myocardium was recently reported in patients with AMI, indicating that extracellular matrix expansion occurs in remote myocardium early after MI. Such extracellular matrix expansion observed in non-infarcted myocardium without edema seems to be one of key factors causing LV remodeling after MI. However, since the previous study only determined post-contrast T1, alteration of extracellular volume fraction (ECV) in remote myocardium early after MI is not investigated quantitatively. Consequently, we sought to quantify ECV in remote normal myocardium in AMI patients using T1 mapping before and after gadolinium contrast with hematocrit and heart-rate corrections, and investigate the association between ECV expansion in remote normal myocardium and extents of infarction and area at risk. Methods

Age-corrected measurement of extracellular volume fraction in remote normal myocardium is correlated with extent of risk area in AMI patients