Secondary Mitral Regurgitation Treatment With MitraClip and Assessment by Cardiac Magnetic Resonance

This study is examining people with heart failure and a leaky mitral valve (the valve between two chambers of the heart) who are being treated with a small clip device called MitraClip. Researchers want to understand how MRI scans of the heart can help track outcomes after this procedure. **You may be eligible if...** - You are 18 or older - You have heart failure with reduced pumping function (ejection fraction below 50%) - You have a significantly leaky mitral valve caused by heart failure (not a valve defect itself) - You are already scheduled to receive the MitraClip procedure - You are on the best possible medication and device treatment for your heart failure **You may NOT be eligible if...** - You are having a heart procedure (PCI) at the same time as the MitraClip - You have a congenital (birth) heart defect - You have end-stage (stage D) heart failure - You have uncontrolled atrial fibrillation - You are pregnant - You have significant problems with other heart valves - You cannot have an MRI scan - You have had a previous mitral valve repair or replacement Talk to your doctor to see if this trial is right for you.