* * *mitral regurgitation n backward flow of blood into the atrium due to mitral insufficiency
* * *(MR) the backflow of blood from the left ventricle into the left atrium, owing to mitral valve insufficiency; it may be acute or chronic, and is usually due to mitral valve prolapse, rheumatic heart disease, or a complication of cardiac dilatation.
(A), Mitral regurgitation (systole); valve incompetence allows backflow from the left ventricle into the left atrium.(B), Tricuspid regurgitation (systole); valve incompetence allows backflow of blood from the right ventricle into the right atrium.
Medical dictionary. 2011.
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