Brain Function and Perfusion in Patients With Heart Failure

Inclusion Criteria Control Group: * Healthy subject, as assessed by clinician * Age matched with patient group Exclusion Criteria Control Group: * Age \< 18 years * Carotid artery or intracranial disease, as assessed by echo-doppler (significant stenosis \> 50%) * Unable or unwilling to undergo MRI * The presence of ferromagnetic material in or on the body, for example tattoos with ferrous ink or pacemakers or cardiac defibrillators. Also the presence of pregnancy and claustrophobia. * History of cognitive impairment * Unable to understand procedures * Unable or unwilling to provide informed consent Inclusion Criteria DCM-group: * Heart failure due to DCM * 15 patients with NYHA class II * 15 patients with NYHA class III/IV Exclusion Criteria DCM-Group: * Age \< 18 years * History of myocardial infarction * History of peripheral artery disease * History of cerebrovascular disease or * Carotid artery or intracranial disease, as assessed by echo-doppler (significant stenosis \> 50%) * History of cognitive impairment * Unable to undergo MRI (eg pacemaker) * Unable to understand procedures * Unable or unwilling to provide informed consent