Mitral valve prolapse and regurgitation
The mitral valve separates the two chambers (atrium and ventricle) of the left side of the heart. In mitral valve prolapse, the leaflets of the mitral valve bulge (prolapse) into the left atrium like a parachute when the heart contracts. Sometimes mitral valve prolapse causes blood to leak back into the atrium from the ventricle, which is called mitral valve regurgitation.
Typical heart and heart with mitral valve stenosis
Mitral valve stenosis, shown in the heart on the right, is a condition in which the heart's mitral valve is narrowed. The valve doesn't open properly, blocking blood flow coming into the left ventricle, the main pumping chamber of the heart. A typical heart is shown on the left.
Mitral valve disease is a problem with the valve located between the left heart chambers (left atrium and left ventricle).
Mitral valve disease includes:
- Mitral valve regurgitation. The mitral valve flaps (leaflets) may not close tightly, causing blood to leak backward.
- Mitral valve stenosis. The flaps of the mitral valve become thick or stiff, and they can fuse together. This narrows the valve opening, which reduces blood flow from the left atrium to the left ventricle.
Treatment for mitral valve disease depends on the severity of the condition and whether it is worsening. Sometimes, surgery is recommended to repair or replace the mitral valve.
Some people with mitral valve disease might not have symptoms for many years, if at all.
Signs and symptoms of mitral valve disease can include:
- Irregular heart sound (heart murmur)
- Irregular heartbeat
- Shortness of breath
When to see a doctor
If you have a heart murmur or develop other signs or symptoms of mitral valve disease, your health care provider might recommend that you visit a doctor that specializes in heart diseases (cardiologist).
Chambers and valves of the heart
A typical heart has two upper and two lower chambers. The upper chambers — the right and left atria — receive incoming blood. The lower chambers — the right and left ventricles — pump blood out of your heart. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings (for the tricuspid and mitral valves) and exits (for the pulmonary and aortic valves).
To understand the causes of mitral valve disease, it may be helpful to know how the heart works.
The mitral valve is one of four valves in the heart that keep blood flowing in the right direction. Each valve has flaps (leaflets) that open and close once during each heartbeat. If a valve doesn't open or close properly, blood flow through the heart to the body can be reduced.
In mitral valve regurgitation, the flaps don't close tightly. Blood flows backward when the valve is closed, making it harder for the heart to work properly.
In mitral valve stenosis, the valve opening narrows. The heart now must work harder to force blood through the smaller valve opening. If the opening in the valve becomes small enough, it can reduce blood flow from the left atrium to the left ventricle.
Mitral valve disease has many causes. Some forms of mitral valve disease can be present at birth (congenital heart defect).
Mitral valve disease may also develop later in life (acquired). For example, mitral valve stenosis is often caused by rheumatic fever. This fever is a complication of a strep infection that can affect the heart. When this happens, it's called rheumatic mitral valve disease.
Other causes of acquired mitral valve disease include:
- Other heart conditions
- Age-related changes
- Autoimmune disease, such as lupus
Several things can increase the risk of mitral valve disease, including:
- Older age
- Certain infections that affect the heart
- Heart attack and some types of heart disease
- Use of certain drugs
- Heart condition present at birth (congenital heart defect)
- Radiation to the chest
Mitral valve disease can cause many complications. Severe mitral valve regurgitation, for example, causes the heart to work harder, which can cause the left ventricle to enlarge and the heart muscle to weaken.
Other complications of mitral valve disease may include:
- Irregular and often rapid heart rate (atrial fibrillation)
- High blood pressure in the blood vessels in the lungs (pulmonary hypertension)
- Blood clots
- Congestive heart failure
Nov. 11, 2021