We turn this week to another valvular problem: mitral regurgitation. Unlike aortic stenosis, where the valve doesn’t open all the way, in mitral regurgitation (usually abbreviated “MR”) the mitral valve (sitting between the left atrium and left ventricle) doesn’t close completely, allowing blood to regurgitate backward. Physicians often describe this condition to their patients as having a “leaky valve.” The causes of…
