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Overview

What Is Mitral Valve Regurgitation?

Mitral valve regurgitation is backward blood flow through the mitral valve when it does not close tightly. Normally, this valve allows blood to move from the left atrium into the left ventricle and then prevents blood from flowing backward when the heart contracts. A leaking heart valve can make the heart work harder to move blood forward. The severity and symptoms of mitral regurgitation vary, and some people have no noticeable symptoms for years.

Symptoms

Symptoms of Mitral Valve Regurgitation

Mild or slowly developing mitral valve regurgitation may cause no noticeable symptoms. As leakage becomes more significant, the heart and lungs may be affected, leading to breathing problems, reduced stamina, or signs of fluid buildup. Symptoms can develop gradually or, less commonly, appear suddenly when severe leakage occurs.

  • Shortness of breath
  • Fatigue
  • Reduced ability to exercise
  • Awareness of a rapid or irregular heartbeat (palpitations)
  • Swelling in the ankles or feet
  • Cough

SEEK URGENT CARE

Sudden or severe symptoms need prompt attention

Get urgent medical help for severe trouble breathing, chest pain, fainting, or blue or gray lips. These symptoms may signal a serious problem and should not be attributed to a leaky valve without prompt assessment.

Causes

Causes of Mitral Valve Regurgitation

Mitral regurgitation occurs when the valve leaflets or the supporting structures around them do not close properly. Primary mitral valve disease results from a problem with the valve itself, while secondary leakage develops when changes in the heart muscle or chambers pull the valve out of position. Several heart conditions can therefore cause mitral insufficiency or heart valve leakage.

  • Mitral valve prolapse can prevent the valve leaflets from meeting tightly.
  • Rheumatic heart disease can scar and deform the valve.
  • Infective endocarditis can damage the valve through infection.
  • A congenital valve abnormality can affect how the valve closes.
  • A heart attack can damage the muscles or supporting tissue that control the valve.
  • Cardiomyopathy can enlarge or weaken the heart and pull the valve out of position.
  • Age-related changes can make the valve or its supporting structures less effective.

Risk Factors

Risk Factors for Mitral Valve Regurgitation

CANNOT BE CHANGED

Older age, family history, inherited connective tissue disorders, and congenital heart or valve differences can increase the likelihood of mitral valve disease.

CAN BE MANAGED

High blood pressure, coronary artery disease, a prior heart attack, cardiomyopathy, rheumatic heart disease, and conditions that increase the risk of infective endocarditis may contribute to mitral incompetence and should be managed with medical care.

Having one or more risk factors does not mean that a person will develop mitral valve regurgitation. Treating cardiovascular conditions, following medical advice, and addressing preventable risks can help protect heart function.

Complications

Complications of Mitral Valve Regurgitation

Trace or mild mitral regurgitation may remain stable and cause no complications. Moderate or severe leakage can place increasing strain on the heart as it handles extra blood, particularly if the condition is progressive or untreated.

  • Heart enlargement can develop as the left atrium or ventricle handles extra blood.
  • Atrial fibrillation can cause an irregular heartbeat and increase clot risk.
  • Pulmonary hypertension can result from increased pressure in the lung blood vessels.
  • Heart failure can occur when the heart can no longer compensate for the leakage.
  • Blood clots can form with certain irregular rhythms and may travel to cause a stroke.
  • Infective endocarditis can damage an already abnormal valve.

Diagnosis

How Mitral Valve Regurgitation Is Diagnosed

Clinicians review the medical history and perform a physical examination, including listening for a characteristic mitral regurgitation murmur. A murmur can suggest valve leakage, but it does not establish how severe the problem is. Imaging and other tests are needed to assess the valve, blood flow, heart chambers, and pumping function.

TestWhat it helps show
EchocardiogramValve structure, backward blood flow, heart chamber size, and pumping function.
ElectrocardiogramHeart rhythm and electrical signs of strain or prior heart damage.
Chest X-rayHeart enlargement or signs of fluid buildup in the lungs.
Cardiac MRI or transesophageal echocardiogramMore detailed valve and heart anatomy when standard imaging is not sufficient.
Cardiac catheterizationPressures and coronary artery information when invasive evaluation is needed.

Clinicians classify leakage as trace, mild, moderate, or severe using imaging findings and the effects on heart size and function, rather than symptoms alone. This is why even people with few symptoms may need periodic testing.

Treatment & Management

Treatment and Management

Treatment depends on whether the leakage is mild, moderate, or severe, whether symptoms are present, whether the heart is enlarging or weakening, and what caused the valve problem. Some people need observation only, while others need medicines for related conditions or a procedure to repair or replace the valve.

MONITORING AND MEDICINES

Regular echocardiograms and clinical visits may be appropriate for stable disease. Medicines can manage blood pressure, fluid retention, irregular rhythms, or heart failure when needed, but they generally do not repair a damaged valve.

VALVE PROCEDURES

Severe or symptomatic disease, worsening heart function, or significant chamber enlargement may lead to surgical repair, catheter-based repair, or valve replacement.

  • Keep scheduled cardiology visits and echocardiograms.
  • Take prescribed medicines as directed and report new side effects.
  • Manage blood pressure, cholesterol, diabetes, and other cardiovascular conditions.
  • Ask the care team what level of physical activity is appropriate.
  • Tell clinicians and dentists about the valve condition before procedures.
  • Report worsening breathlessness, swelling, palpitations, chest pain, or fainting.

Prevention

Can Mitral Valve Regurgitation Be Prevented?

Not all mitral valve regurgitation can be prevented, particularly when it is caused by inherited, congenital, or age-related changes. However, good cardiovascular care may reduce some risks and help limit related heart damage.

  • Control high blood pressure and other cardiovascular risk factors.
  • Do not smoke, and seek help to stop if needed.
  • Follow a heart-healthy eating and activity plan.
  • Treat suspected streptococcal infections promptly when advised by a clinician.
  • Ask whether special infection precautions apply to your valve condition or procedures.
  • Attend recommended checkups if you have a murmur or known valve disease.

Outlook and Prognosis

Outlook and Prognosis

Trace or mild mitral valve regurgitation often remains stable and may only require monitoring. Progressive or severe regurgitation can affect heart function, but timely treatment may repair the valve, replace it, or reduce its effects on the heart.

Ongoing follow-up is important even when symptoms are absent because changes in heart size or function may appear before a person feels unwell. Keeping appointments can help identify when management needs to change.

When Should You See a Doctor

When Should You See a Doctor?

  • Ask for an evaluation if a clinician detects a new heart murmur.
  • Schedule an appointment for unexplained shortness of breath or fatigue.
  • Seek evaluation for a new decline in exercise tolerance.
  • Contact a clinician about new or persistent palpitations.
  • Arrange medical assessment for swelling in the ankles, feet, or abdomen.
  • Keep routine cardiology follow-up if mitral regurgitation has already been diagnosed.

GET EMERGENCY HELP

Know when symptoms are an emergency

Contact local emergency services for severe trouble breathing, chest pain, fainting, sudden weakness or confusion, or blue or gray lips. Do not drive yourself if you are severely unwell.

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