What Causes Mitral Valve Regurgitation & How Is It Treated?

Mitral valve regurgitation is a condition where the mitral valve does not close properly, causing blood to leak backward inside the heart. It may cause symptoms like fatigue, shortness of breath, or heart palpitations, although mild cases often have no symptoms and may only need regular monitoring.

For many people, a leaky mitral valve is manageable with regular follow-up. More serious or severe mitral regurgitation may require medication, closer monitoring, valve repair, or valve replacement.

What Is Mitral Valve Regurgitation?

Mitral valve regurgitation, also called mitral regurgitation, mitral insufficiency, mitral valve leakage, or a leaky heart valve, happens when the mitral valve allows blood to flow backward instead of forward.

The mitral valve is one of the four valves in the heart. It sits between the left atrium, the upper-left chamber of the heart, and the left ventricle, the main pumping chamber that sends oxygen-rich blood to the body.

Normally, blood flows from the lungs into the left atrium, passes through the mitral valve into the left ventricle, and then gets pumped out through the aorta to the rest of the body. When the mitral valve closes properly, it prevents blood from leaking backward.

With a mitral valve leak, the valve does not seal tightly. Each time the left ventricle contracts, some blood leaks backward into the left atrium. This backward flow is called regurgitation.

In mild cases, the heart may compensate well. In more advanced cases, the heart has to work harder, which can eventually lead to heart enlargement, abnormal rhythms, shortness of breath, or heart failure.

How Does A Leaky Mitral Valve Affect Heart Function?

A leaky valve in the heart changes how efficiently blood moves through the heart.

When blood leaks backward through the mitral valve, the left side of the heart may need to handle more blood volume than usual. Over time, this extra workload can stretch the left atrium and left ventricle.

This may lead to:

• Less efficient blood flow to the body
• Increased pressure in the lungs
• Enlargement of the left atrium or left ventricle
• Irregular heart rhythms such as atrial fibrillation
• Worsening fatigue or shortness of breath
• Heart failure in severe untreated cases

That said, not every leaking heart valve is dangerous. Trace mitral valve regurgitation or mild mitral valve regurgitation is commonly found during an echocardiogram and may not require treatment beyond routine follow-up.

What Causes Mitral Valve Regurgitation?

The causes of mitral valve regurgitation vary. Some people are born with valve abnormalities, while others develop mitral valve disease later in life.

Doctors often group mitral regurgitation into two main categories: primary mitral regurgitation and secondary mitral regurgitation.

Primary Mitral Regurgitation

Primary mitral regurgitation means the problem begins with the mitral valve itself. The valve leaflets, cords, or supporting structures may become stretched, damaged, infected, or weakened.

Common causes include:

• Mitral valve prolapse
• Aging-related valve degeneration
• Rheumatic heart disease
• Endocarditis, which is an infection of the heart valve
• Congenital valve abnormalities
• Damage from chest radiation or trauma in rare cases

Secondary Mitral Regurgitation

Secondary mitral regurgitation means the valve may be structurally normal, but another heart problem prevents it from closing properly.

This can happen when the left ventricle becomes enlarged, weakened, or misshapen. As the heart chamber stretches, it can pull the mitral valve apart and create a leak.

Common causes include:

• Heart attack damage
• Cardiomyopathy
• Enlarged heart
• Coronary artery disease
• Long-standing high blood pressure
• Heart failure

Common Causes Of Mitral Valve Regurgitation

There are several reasons why the mitral valve may start leaking. Understanding these causes can help guide monitoring and treatment.

Mitral Valve Prolapse

Mitral valve prolapse is one of the most common causes of mitral regurgitation. It happens when one or both mitral valve leaflets bulge backward into the left atrium during a heartbeat.

Some people with mitral valve prolapse never develop significant leakage. Others may develop a leaky mitral valve if the valve leaflets do not close tightly.

Aging And Valve Degeneration

As people age, the valve tissue can become weaker, stretched, or calcified. This can prevent the mitral valve from sealing properly.

Degenerative valve disease is a common reason older adults develop mitral valve regurgitation symptoms or are told they have a leaking heart valve after an echocardiogram.

Rheumatic Heart Disease

Rheumatic fever can damage heart valves, including the mitral valve. Although less common in the United States than in the past, rheumatic heart disease remains an important cause of heart valve leaking worldwide.

Heart Attack Damage

A heart attack can damage the heart muscle or the structures that support the mitral valve. This can lead to sudden or progressive mitral valve leakage.

If mitral regurgitation develops suddenly after a heart attack, it can be serious and may require urgent care.

Enlarged or Weakened Heart

When the left ventricle becomes enlarged, the mitral valve may be pulled out of position. Even if the valve itself is not damaged, it may not close properly.

This type of cardiac regurgitation is often related to cardiomyopathy, heart failure, or long-standing heart disease.

Endocarditis

Endocarditis is an infection of the inner lining of the heart or heart valves. It can damage valve tissue and cause acute or worsening mitral insufficiency.

Congenital Heart Valve Problems

Some people are born with valve differences that make regurgitation more likely. These may be found early in life or discovered later during cardiac testing.

Symptoms Of Mitral Valve Regurgitation

Mitral regurgitation symptoms can vary widely. Some people have no symptoms at all, especially with trace mitral regurgitation or mild disease. Others develop symptoms gradually over months or years.

Common symptoms of mitral regurgitation include:

• Fatigue or reduced stamina
• Shortness of breath, especially with activity or lying flat
• Heart palpitations
• Rapid or irregular heartbeat
• Swollen ankles, feet, or legs
• Chest discomfort
• Cough, especially at night or when lying down
• Dizziness or lightheadedness
• Reduced ability to exercise

Many leaking heart valve symptoms overlap with other heart and lung conditions. That is why testing is important. An echocardiogram can show whether a mitral valve leak is present and how severe it is.

Mild vs Moderate vs Severe Mitral Regurgitation

Mitral regurgitation is often described as trace, mild, moderate, or severe. These categories help doctors decide whether you need monitoring, medication, additional testing, or a procedure.

Trace Mitral Regurgitation

Trace mitral regurgitation or trace mitral valve regurgitation means there is a very small amount of backward blood flow.

This is often found incidentally during an echocardiogram. In many people, trace regurgitation does not cause symptoms and does not require treatment.

Mild Mitral Valve Regurgitation

Mild mitral valve regurgitation means the valve leak is small. Many people with mild disease feel well and live normal lives.

Mild cases usually require:

• Periodic follow-up
• Echocardiogram monitoring
• Blood pressure control
• Attention to new or worsening symptoms

Moderate Mitral Regurgitation

Moderate mitral regurgitation means the leak is more significant. The heart may still function well, but doctors usually monitor the condition more closely.

You may need repeat imaging to check heart size, valve function, and pumping strength.

Severe Mitral Regurgitation

Severe mitral regurgitation or severe mitral valve regurgitation means a large amount of blood is leaking backward.

Severe disease may cause symptoms and can lead to complications if untreated. Some people with severe disease need valve repair or valve replacement, even if symptoms are not yet obvious.

What Is A Mitral Regurgitation Murmur?

A mitral regurgitation murmur is an extra or unusual sound heard during a heartbeat. It happens because blood is flowing backward through the mitral valve instead of moving smoothly forward.

Doctors often detect this murmur with a stethoscope during a physical exam. A murmur does not automatically mean severe disease, but it is an important clue.

If your doctor hears a murmur, they may recommend an echocardiogram to confirm whether you have mitral valve regurgitation, how much leakage is present, and whether the heart chambers are affected.

How Is Mitral Valve Regurgitation Diagnosed?

Diagnosis usually begins with a conversation about your symptoms, medical history, and risk factors. Your cardiologist will also listen for a heart murmur and check for signs of fluid retention or abnormal heart rhythm.

Common tests include:

Echocardiogram

An echocardiogram is the most important test for diagnosing mitral valve regurgitation. It uses ultrasound to create moving images of the heart.

It can show:

• Whether the mitral valve is leaking
• The severity of the leak
• Heart chamber size
• Heart pumping function
• Valve structure and movement
• Pressure changes in the heart and lungs

For many patients, this test provides the clearest answer about whether a leaky mitral valve is mild, moderate, or severe.

Electrocardiogram (ECG)

An electrocardiogram ( ECG ) records the electrical activity of the heart. It can help detect abnormal rhythms, prior heart attack patterns, or signs of heart strain.

Chest X-Ray

A chest X-ray may show whether the heart is enlarged or whether fluid is backing up into the lungs.

Cardiac MRI

Cardiac MRI may be used in some cases when more detail is needed. It can help measure heart size, pumping function, and the amount of regurgitation.

Stress Testing

A stress test may be recommended if symptoms occur with activity or if doctors want to understand how the valve problem affects exercise capacity.

Holter Monitor

If you have palpitations, skipped beats, or a racing heartbeat, your doctor may recommend a holter monitor or other rhythm monitor to check for arrhythmias.

Treatment Options For Mitral Valve Regurgitation

Mitral valve regurgitation treatment depends on the cause, severity, symptoms, heart function, and overall health.

Not everyone needs surgery. Many people with trace or mild disease only need monitoring.

Monitoring for Mild Cases

If your leaky mitral valve is mild and you have no symptoms, your cardiologist at Cardiology Care NYC may recommend regular follow-up instead of immediate treatment.

Monitoring may include:

• Routine cardiology visits
• Repeat echocardiograms
• Blood pressure management
• Symptom tracking
• Lifestyle changes to support heart health

Lifestyle And Heart Health Changes

Lifestyle changes cannot always fix a structural valve leak, but they can reduce stress on the heart and help manage related cardiovascular risks.

Helpful steps may include:

• Controlling blood pressure
• Eating a heart-healthy diet
• Staying physically active as advised by your doctor
• Avoiding smoking
• Managing cholesterol
• Limiting excess sodium if fluid retention is present
• Maintaining a healthy weight
• Managing diabetes or sleep apnea if present

Medications

Medications usually do not repair the leaking valve itself, but they may help manage symptoms or related conditions.

Depending on your situation, treatment may include:

• Blood pressure medications to reduce strain on the heart
• Diuretics to reduce fluid buildup and swelling
• Medications for heart rhythm problems
• Blood thinners if atrial fibrillation or another clotting risk is present
• Heart failure medications if the heart muscle is weakened

Your cardiologist will choose medications based on your symptoms, test results, and other medical conditions.

Mitral Valve Repair

Mitral valve repair is often preferred when the valve can be safely repaired. Repair preserves the patient’s own valve and may offer long-term benefits in appropriate cases.

Repair may involve reshaping valve tissue, fixing torn cords, tightening the valve ring, or improving how the leaflets close.

Mitral Valve Replacement

If the valve is too damaged to repair, replacement may be recommended. The damaged valve is replaced with either a mechanical valve or a biological tissue valve.

Each option has benefits and considerations. Your care team will discuss which type is best based on your age, health, lifestyle, and long-term treatment needs.

Transcatheter Procedures

Some patients who are at higher risk for open-heart surgery may be candidates for less invasive transcatheter procedures. These approaches can reduce leakage by helping the mitral valve close more effectively.

Not everyone is a candidate. Advanced imaging is usually needed to decide whether this approach is appropriate.

Can Mitral Valve Regurgitation Be Serious?

Yes, mitral valve regurgitation can be serious, especially when the leak is severe, worsening, or affecting heart function.

Possible complications include:

• Heart enlargement
• Atrial fibrillation
• Heart failure
• Pulmonary hypertension
• Fluid buildup in the lungs
• Reduced exercise capacity
• Blood clot or stroke risk in some patients with atrial fibrillation

The goal of monitoring is to identify changes before permanent heart damage occurs. This is why people with moderate or severe heart regurgitation should have regular cardiology follow-up.

Living With A Leaky Heart Valve

Living with a leaky heart valve can feel unsettling, especially if the diagnosis was unexpected. The good news is that many people with mild regurgitation continue normal daily activities with periodic monitoring.

Practical tips include:

• Keep regular follow-up appointments
• Ask how often you need an echocardiogram
• Track symptoms such as breathlessness, swelling, and palpitations
• Follow blood pressure treatment plan
• Stay active within your doctor’s recommendations
• Choose a heart-healthy diet rich in fruits, vegetables, lean proteins, and whole grains
• Avoid smoking
• Tell your doctor if symptoms change

Exercise is often safe for people with mild disease, but recommendations may differ if regurgitation is moderate or severe. Always ask your cardiologist what level of activity is appropriate for you.

When Should You See A Doctor?

You should schedule a cardiology consultation if you have symptoms that may suggest heart valve regurgitation, especially if they are new, worsening, or affecting daily life.

See a doctor if you experience:

• Shortness of breath
• Chest pain or chest pressure
• Swelling in the ankles, feet, legs, or abdomen
• Rapid, fluttering, or irregular heartbeat
• Unexplained fatigue
• Reduced exercise tolerance
• Dizziness or fainting
• A known heart murmur
• A prior echocardiogram showing mitral regurgitation

Seek urgent medical care for severe chest pain, fainting, or sudden shortness of breath. In NYC, if you have a leaking heart valve, Cardiology Care NYC can evaluate your condition and guide next steps with cardiac testing, including echocardiography and ECG.

Long-Term Outlook For Mitral Valve Regurgitation

The outlook depends on the cause, severity, symptoms, and how the heart responds over time.

Many people with trace or mild regurgitation do very well with monitoring. Moderate disease may remain stable, but it should be followed closely. Severe disease may require intervention to prevent long-term heart damage.

Early diagnosis matters because treatment decisions are often based not only on symptoms, but also on heart size, pumping function, rhythm changes, and pressure changes in the lungs.

With the right follow-up plan, many patients can manage mitral regurgitation effectively and maintain a good quality of life.

Conclusion

Mitral valve regurgitation is a manageable heart condition when detected early. Regular monitoring, lifestyle adjustments, and timely treatment can help maintain heart health and prevent complications. Consulting with a cardiologist at Cardiology Care NYC ensures proper evaluation, guidance, and personalized care for optimal long-term outcomes.

Frequently Asked Questions

Can pregnancy affect mitral valve regurgitation?

Pregnancy can increase blood volume and cardiac workload, sometimes worsening pre-existing regurgitation. Most mild cases remain stable, but monitoring is important.

Does exercise worsen a leaky mitral valve?

Regular, moderate exercise is generally safe for mild regurgitation, but high-intensity or competitive sports may need evaluation by a cardiologist.

Can infections trigger worsening of mitral regurgitation?

Severe infections, especially endocarditis, can damage the mitral valve and exacerbate leakage, making prompt treatment critical.

Is mitral regurgitation hereditary?

Some valve conditions, like mitral valve prolapse, may run in families, increasing the likelihood of regurgitation among relatives.

Does mitral regurgitation affect lifespan?

With proper monitoring and treatment, many patients with mild or moderate regurgitation live normal lifespans. Severe, untreated cases may impact long-term heart health.

Source

1. Manhattan Cardiology – Mitral Valve Prolapse vs. Mitral Regurgitation: What’s the difference?
2. American Heart Association – Problem: Mitral Valve Regurgitation
3. Columbia Surgery – Guide to Mitral Valve Regurgitation
4. Cardio Smart – What Causes Mitral Regurgitation?
5. Mayo Clinic – Mitral valve regurgitation – Symptoms and causes
6. Cleveland Clinic – What is mitral valve regurgitation?

Disclaimer

This blog is for informational & educational purposes only and does not intend to substitute any professional medical advice or consultation. For any health-related concerns, please consult with your physician, or call 911.