Mitral Valve Disease

The mitral valve is between the left atrium and left ventricle, the two chambers on the left side of the heart. It opens to let oxygen-rich blood move into the left ventricle and closes to keep blood from flowing backward. Mitral valve disease occurs when the valve is narrowed, leaks, or moves abnormally, disrupting normal blood flow. It can affect people because of age-related changes, inherited conditions, previous illness, infection, or changes in the heart.

Symptoms depend on whether the mitral valve is narrowed or leaking, how severe the problem is, and whether the heart has started to compensate. Mild disease may cause no noticeable symptoms and may be found during an examination or echocardiogram. As blood flow becomes more disrupted, symptoms can develop during activity or eventually at rest.

Causes vary by the type of mitral valve disease. Problems may affect the valve leaflets, the supporting cords and muscles, or the heart chambers that support valve function. Infection and inflammation can damage valve tissue, while changes in the heart can stretch or weaken the structures that keep the valve closed.

Acquired contributors include rheumatic heart disease, age-related valve changes, connective-tissue disorders, previous heart injury, and infective endocarditis. Congenital differences in the valve can be present from birth. Enlargement or weakening of the heart may also cause or worsen mitral regurgitation, sometimes called mitral incompetence.

Factors You Cannot Change

Medical and Potentially Modifiable Contributors

High blood pressure, coronary artery disease, a previous heart attack, and conditions that enlarge or weaken the heart can increase strain on the mitral valve. The risk of valve infection may be higher in selected situations, depending on a person’s medical history. Managing cardiovascular conditions, receiving appropriate infection care, and following specialist advice may reduce some risks, but not every case of mitral valve disease can be prevented.

Complication risk depends on the type and severity of valve disease, symptoms, heart function, and how consistently the condition is monitored and treated. A leaky valve in the heart may remain stable for years, while severe or untreated disease can affect the rhythm, lungs, and circulation.

Diagnosis begins with a medical history and review of symptoms, followed by blood pressure measurement and a heart examination. A clinician may listen for a heart murmur or other sounds that suggest altered blood flow. The findings help determine whether further tests are needed to identify the type and severity of mitral valve disease.

Treatment depends on the valve problem, its severity, symptoms, heart rhythm, heart function, age, overall health, and procedural risk. Some people with mild or stable disease need monitoring only, while others need medicines or a procedure to improve blood flow. A cardiology team uses these factors to create an individualized plan.

Long-term care may include follow-up echocardiograms, heart-healthy habits, and treatment of related conditions such as high blood pressure or an irregular rhythm. Anticoagulation may be recommended when clinically indicated, but it is not needed for everyone. When appropriate, catheter-based repair or replacement can be considered; selected patients may need surgical mitral valve repair or replacement. These options are reviewed by a specialist team based on the person’s mitral disease, symptoms, and procedural risk.

There is no universal way to prevent mitral valve disease, especially when it is inherited, congenital, or related to aging. However, managing blood pressure and cardiovascular risk, treating infections promptly, and preventing rheumatic fever where relevant may lower the risk of some acquired forms. Healthy habits cannot reverse structural valve disease, but they can support overall heart health.

Mild or stable mitral valve disease may remain manageable for years with regular follow-up. Severe or progressive leakage or narrowing can weaken the heart without appropriate treatment, but monitoring, medicines, and valve procedures can reduce symptoms and protect heart function for many people. The long-term outlook varies from person to person.

Arrange a medical evaluation for new or persistent shortness of breath, fatigue, palpitations, swelling, chest discomfort, or fainting. A newly diagnosed heart murmur also warrants assessment, even if you feel well. If mitral valve disease is already known, follow the visit and echocardiogram schedule recommended by your care team.