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Recent CMR technique provides assessment of myocardial ECV in LV wall derived from pre- and post-contrast T1 maps in patients with AF. In 40-year-old man with persistent AF, ECV map shows mean LV myocardial ECV of 31.69%. Usually, it has been widely accepted that mean LV myocardial ECV is less than 28% in healthy individuals without definite cardiomyopathy. ECV = extracellular volume fraction
