Mitral regurgitation or mitral incompetence is a disorder of the heart in which the mitral valvedoes not close properly when the heart pumps out blood. It is the abnormal leaking of blood backwards from the left ventricle, through the mitral valve, into the left atrium, when the left ventricle contracts, i.e. there is regurgitation of blood back into the left atrium. MI is the most common form of valvular heart disease.
A heart attack damages the muscles around the mitral valve.
The cords that attach the muscle to the valve break.
An infection of the valve destroys part of the valve.
There are often no symptoms. When symptoms occur, they often develop gradually, and may include:
Fatigue, exhaustion, and light-headedness
Sensation of feeling the heart beat (palpitations) or a rapid heartbeat
Shortness of breath that increases with activity and when lying down
Waking up an hour or so after falling asleep because of trouble breathing