The mitral valve controls blood flow through the left side of your heart. When it opens, the mitral valve allows blood to flow into the left ventricle, which is the heart’s main pumping chamber. When the left ventricle contracts, the mitral valve closes, preventing blood from flowing back toward the lungs.
In some cases, the mitral valve is abnormal from birth. It can also become damaged by infection, with age or from heart disease. Mitral valve disease can be either regurgitation (MR) or stenosis (MS).
- Mitral Regurgitation (MR) is a condition where the valve doesn’t close properly, which can allow blood to flow backwards in the heart. This is the most common valve condition, and it affects about 4 million adults in the United States.
- Mitral Stenosis (MS) is a condition in which the opening of the mitral valve is narrowed, resulting in restricted blood flow to the left ventricle.