Usually not ...: Mitral valve prolapse occurs when the leaflets of the mitral valve, between the heart's left atrium and ventricle, bulge upward or back into the left atrium as the heart contracts. When more severe, it causes leakage of blood back into the atrium--mitral regurgitation--which can cause fatigue. But the majority of cases of mitral valve prolapse are not this severe and cause few, if any, symptoms.
Answered 8/8/2016
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