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Mitral Valve Disorders

One of the heart's four valves, the mitral valve is located between the heart's upper-left chamber, called the left atrium, and the heart's lower-left chamber, called the left ventricle.

Valves control blood flow through the heart. The mitral valve controls blood flow from the left atrium into the left ventricle. When the heart contracts, the mitral valve closes to prevent blood from backing up into the lungs. If the valve becomes diseased or damaged, it may be surgically repaired or replaced to restore function.

If left untreated, mitral valve disease may lead to more serious problems, such as heart dilation, in which the heart's walls become stretched and weakened. As a result, heart rhythm problems may occur, including atrial fibrillation.

Types of Mitral Valve Disorders

The two most common conditions that require mitral valve repair include:

  • Mitral Valve Prolapse Myxomatous degeneration of the valve, also known as "floppy valve" or mitral valve prolapse, is the most common condition that requires mitral valve repair. It occurs when the mitral valve leaflets become floppy or loose and the valve does not open and close properly. In most cases, it does not cause symptoms and therefore treatment is not required.

    However, in more severe cases, the condition may cause mitral valve regurgitation, in which the blood leaks backwards into the lungs. This may result in heart dilation, in which the heart's walls become stretched and weakened. As a result, heart rhythm problems may occur, including atrial fibrillation. Almost all of leaky valves caused by myxomatous degeneration can be successfully repaired with surgery.
  • Mitral Valve Stenosis Mitral valve stenosis is a narrowing of the opening of the mitral valve, which can prevent the valve from opening and closing normally, reducing the amount of blood flow through the heart. Over time, stenosis can cause high blood pressure in the left atrium and the lungs, which can lead to breathing difficulties.

Other conditions that may require mitral valve repair include:

  • Endocarditis This is an infection affecting the heart valves or the inner surface, called the endocardium, of the heart. Endocarditis typically occurs when bacteria or other germs in the mouth, intestinal tract or urinary tract travel to the heart via the bloodstream and lodge in the heart. These bacteria usually don't cause problems in normal hearts, but hearts with defects or those that have been repaired are vulnerable to infection. Once infection occurs, the bacteria continue to grow and may seriously damage the heart.
  • Heart Failure Heart failure develops when the heart doesn't function properly. The names "heart failure" and "congestive heart failure" (CHF) often confuse people since the heart hasn't actually "failed" or stopped. Heart failure is a medical term that describes the condition in which one or more chambers of the heart "fail" to keep up with the volume of blood flowing through them. Heart failure can be brought on by a variety of underlying diseases and health problems.

    Patients with end-stage heart failure who have severe regurgitation — in which the blood leaks backwards into the lungs — may require mitral valve repair. However, many of these patients will eventually need a heart transplant.

Our Approach to Mitral Valve Disorders

At UCSF, patients with mitral valve disorders are treated by a team of specialists in heart valve problems, including interventional cardiologists and cardiothoracic surgeons. We offer the full range of therapy options, including minimally invasive approaches to repairing or replacing the valve. Compared with traditional open heart surgery, these procedures have many benefits for patients, including faster recovery, less postoperative pain and minimal scarring.

Research shows that when faulty valves are repaired early on, before they lead to heart damage, patients have much better immediate and long-term results. Our surgeons have had tremendous success in repairing early-stage mitral valve disorders. Research has also shown many advantages to surgically repairing – rather than replacing – a mitral valve. In certain cases, however, the valve may be so seriously damaged that replacement is recommended.

Awards & recognition

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    Among the top hospitals in the nation

  • One of the nation’s best in cardiology & heart surgery

UCSF Health medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.