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| Mitral regurgitation (schematic drawing) During systole, contraction of the left ventricle causes abnormal backflow (arrow) into the left atrium. 1 Mitral valve 2 Left Ventricle 3 Left Atrium 4 Aorta |
Mitral regurgitation (MR), a valvular heart disease also known as mitral insufficiency or mitral incompetence, is the abnormal leaking of blood through the mitral valve, from the left ventricle into the left atrium of the heart.
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