Diastolic dysfunction and left atrial enlargement as contributing factors to functional mitral regurgitation in dilated cardiomyopathy: Data from the Acorn trial

For patients with DCM in the Acorn trial, MR severity was associated with LA volume and mitral annular area but not with LV volume. Mitral annular area and LA volume were closely related, even in patients without significant MR. These findings suggest that LA enlargement caused by advanced diastolic dysfunction may contribute to causing significant MR by augmenting mitral annular dilatation in DCM.