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Risk stratification for sudden cardiac death (SCD) in patients with non-ischemic cardiomyopathy (NICM) remains suboptimal. Although current guidelines rely on severe left ventricular systolic dysfunction (left ventricular ejection fraction (LVEF) \< 35%) as key predictor of arrhythmic risk and clinical indication of prophylactic implantable cardioverter defibrillator (ICD), this approach seems inadequate, since registries report that only a minority of NICM ICD carriers experience an appropriate ICD shock during follow-up, whereas out-of-hospital cardiac arrests (OHCA) occur in patients with LVEF\>35% in up to 80% of cases. Moreover, pivotal primary prevention trials (DANISH trial, long-term outcome of the SCD-HeFT trial) failed to demonstrate a net mortality benefit of ICD in patients with NICM. As for most structural heart diseases (SHD), scar-related reentry has been addressed as the
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