Cardiac Magnetic Resonance Guidance of Implantable Cardioverter Defibrillator Implantation in Non-ischemic Dilated Cardiomyopathy

Inclusion Criteria: * NIDCM (idiopathic or familial)\* * LVEF ≤35% and presence of fibrosis on CMR * Diagnostic CMR scan * Age ≥18 years * Written informed consent * Ability to give informed consent Exclusion Criteria: * ICM \[previous myocardial infarction, previous percutaneous coronary intervention\] * Other cardiomyopathies (hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, restrictive cardiomyopathy, infiltrative cardiomyopathies \[e.g. cardiac amyloidosis, cardiac sarcoidosis, hemochromatosis and iron overload cardiomyopathy\], left ventricular non-compaction cardiomyopathy, reversible cardiomyopathies \[Takotsubo syndrrome, peripartum cardiomyopathy, chemotherapy induced cardiomyopathy\]. * Myocarditis * Contraindication for CMR at study entry (including severe claustrophobia, pacemaker or ICD, metallic cerebral or intracranial implants, known allergy to gadolinium) * Severe renal insufficiency (creatinine clearance \<30 mL/min) * Current pacemaker or defibrillator in situ * Current indication for device therapy (e.g. secondary prophylaxis after aborted SCD) * Renal impairment defined as an eGFR \<30 milliliters * Age \<18 years * Patients presenting with pregnancy * Patients without informed consent * Participation in another randomized trial * Life expectancy \<2 years