- Substantial dysfunctional but viable myocardium as demonstrated by the baseline CMR: Based on a standard 17-segment model (AHA - American Heart Association), 3 or more segments require demonstration of dysfunction (defined by visible assessment of the performing investigator) and viability (defined as < 25% of segment area with scar burden - in patients with CAD (Coronary Artery Disease) or no (i.e. zero) scar burden in patients without CAD [idiopathic CM patient])