Routine vs Selective Cardiac Magnetic Resonance in Non-Ischemic Heart Failure

Primary objective: to compare the effect of routine cardiac magnetic resonance (CMR) versus standard care (i.e. echocardiography with only selective use of CMR) on the etiological diagnosis in patients with a non-ischemic heart failure (HF). The proposed categories of HF to be considered in this study include: idiopathic dilated cardiomyopathy, infiltrative cardiomyopathy, inflammatory, hypertrophic cardiomyopathy, heart failure with preserved ejection fraction (HFPEF), ischemic cardiomyopathy, mixed etiology and other (eg. pericardial, congenital, non-compaction, right ventricular failure). Primary hypothesis: Routine use of CMR (vs. selective use) will lead to a more specific diagnostic characterization of the underlying etiology of non-ischemic heart failure. This will lead to a reduction in the diagnosis of idiopathic dilated cardiomyopathy and HFPEF. Secondary objectives: Determine the effects that routine use of CMR in non-ischemic HF has on therapeutic decisions, on the Composite Clinical Endpoint (CCE), cardiac function, symptoms, quality of life (QoL), and costs. Ancillary measurements will include the safety of imaging tests and adverse reactions to gadolinium contrast agent. Secondary hypothesis: Routine use of CMR will have significant impact on treatment decisions, (1) lead to more disease specific therapies and/or (2) cause a significant change in the number and class of HF meds, during follow-up. The routine CMR group will also have improved clinical outcomes (CCE), symptoms and QoL and decreased costs to the standard of care group during follow-up. Design Methods: Randomized controlled trial comparing i) routine CMR vs. ii) echocardiography with selective CMR in patient with HF due to NICM and/or HFPEF. Among patients enrolled in Level I of IMAGE-HF, it is expected that 504 will have known NICM (or strongly suspected based on young age, absent risk factors and presenting history) and/or HFPEF. Tertiary care sites (in Canada and Finland) with dedicated HF programs will participate in the study. Consecutive patients will be enrolled at sites with dedicated CMR programs (defined as minimum 200 cases/year and maximum 2 weeks waiting time in the majority of patients) and randomized to routine CMR or selective CMR. Non-ischemic HF patients from sites without dedicated CMR programs will be included in a registry of patients undergoing routine HF care (i.e. selective use of CMR). Participants in the selective CMR arm may ONLY undergo CMR for a suspicion of: 1) infiltrative myocardial disease, 2) arrhythmogenic right ventricular cardiomyopathy, 3) adult congenital heart disease or 4) pericardial disease following standard HF care including echocardiography. Other tertiary sites may be added in year 2-3 depending on recruitment needs and registry sites may become randomization sites if the experience and wait-time criteria are met.