Illustration of the mechanism of functional mitral regurgitation. Echocardiographic images in the parasternal long-axis view at end-systole in a patient with dilated cardiomyopathy and severe mitral regurgitation. The mitral annulus plane is indicated by the line. Notice that the leaflets are “tented” at end-systole in the patient with dilated cardiomyopathy, with a greater distance between the annulus plane and leaflet closure line (arrow) LV, Left ventricle; LA, Left atrium