CMR enables noninvasive evaluation of cardiac anatomy, including great arteries and veins, and cardiac chambers. It provides excellent evaluation of both the left ventricle (LV) and right ventricle (RV), including ventricular size, thickness, wall motion, volumes, and ejection fraction (EF), without the need for geometric assumptions. Many consider CMR to be the gold standard for quantifying ventricular volumes and EF. In addition, CMR can better define valvular disease due to its ability to precisely quantify regurgitant volumes and fractions without limitation from acoustic windows, or highly eccentric/multiple jets. Feasibility and safety of CMR after MitraClip placement has previously been shown [5]. In order to obtain a concurrent comparison of CMR with echocardiography, a comprehensive 2D/3D echo with Doppler will be performed immediately before or after the CMR scan. The echocardiography protocol will be outlined in detail in the Echo Imaging Manual.