Mitral / tricuspid valve regurgitation

What Is Mitral and Tricuspid Valve Regurgitation?

The mitral valve and tricuspid valve sit between the upper and lower chambers on the left and right sides of the heart, opening to let blood flow forward and closing tightly to prevent it from flowing backward. Regurgitation occurs when one of these valves fails to close completely, allowing blood to leak backward with each heartbeat rather than moving efficiently in one direction.¹

Mitral regurgitation affects the valve between the left atrium and left ventricle and is one of the most common valve disorders diagnosed in adults. With each contraction of the left ventricle, some blood moves forward into circulation as intended, while a portion leaks backward into the left atrium instead, forcing the heart to work harder to maintain adequate output to the rest of the body.¹

Tricuspid regurgitation affects the corresponding valve on the right side of the heart, between the right atrium and right ventricle. For years it was sometimes called the forgotten valve, since it received far less clinical attention than the mitral or aortic valves, but growing evidence now links significant tricuspid regurgitation to worse outcomes and a meaningful effect on quality of life.²

Tricuspid regurgitation mirrors chronic right heart failure, including systemic fluid retention, weakness, and reduced cardiac output.
National Center for Biotechnology Information

Symptoms

Mild regurgitation in either valve frequently causes no symptoms at all and may only be discovered incidentally during an exam for an unrelated reason. As leakage becomes more severe, however, symptoms tend to develop gradually and can be easy to attribute to normal aging or general deconditioning.¹

Shortness of breath, fatigue, and a reduced ability to tolerate physical activity are common with both mitral and tricuspid regurgitation, since the heart must compensate for blood that is not moving forward efficiently. As mitral regurgitation worsens, fluid can build up in the lungs, making breathing progressively more difficult, particularly when lying flat.¹

Severe tricuspid regurgitation tends to produce symptoms that closely resemble right sided heart failure, including swelling in the legs and abdomen, distended neck veins, weakness, and in advanced cases, signs of reduced blood flow to other organs of the body.²

Causes

Mitral regurgitation is generally divided into two categories. Primary, or degenerative, mitral regurgitation results from a structural problem within the valve itself, such as a floppy or prolapsing leaflet, torn supporting structures, or calcification of the tissue surrounding the valve. Secondary, or functional, mitral regurgitation occurs when the valve itself is structurally normal but fails to close properly because the surrounding heart chamber has become enlarged or misshapen, often as a result of prior heart attack or long standing heart failure.³

Tricuspid regurgitation follows a similar pattern, and secondary or functional cases account for roughly 80 percent of all diagnoses. These cases typically result from enlargement of the right atrium or right ventricle, frequently driven by atrial fibrillation, heart failure with preserved ejection fraction, or elevated pressure in the lungs called pulmonary hypertension.⁴

Less commonly, tricuspid regurgitation results from a primary problem with the valve leaflets themselves, which can occur due to infection, prior placement of a pacemaker lead across the valve, rheumatic disease, or, more rarely, a congenital abnormality present from birth.²

Risk Factors

Age is one of the strongest risk factors for both conditions, since valve tissue naturally degrades over time and the cumulative effects of other cardiovascular disease increase the likelihood that a valve will begin leaking. A prior heart attack, long standing high blood pressure, and chronic heart failure all raise risk for secondary valve regurgitation on either side of the heart.³

Atrial fibrillation is closely tied to tricuspid regurgitation risk, since the irregular rhythm often leads to progressive enlargement of the right atrium, which in turn stretches the tricuspid valve annulus and prevents the leaflets from meeting properly.⁴

A history of rheumatic fever, prior valve infection, connective tissue disorders that weaken supporting valve structures, and the presence of a pacemaker or defibrillator lead passing through the tricuspid valve are additional recognized risk factors for developing regurgitation over time.²

Complications

Left untreated, significant mitral regurgitation can cause the left atrium to enlarge over time, creating conditions favorable for atrial fibrillation, which itself raises the risk of blood clots and stroke. Chronically elevated pressure within the heart and lungs can also lead to pulmonary hypertension, a serious complication in its own right.¹

Progressive volume overload from either valve can eventually weaken the heart muscle itself, contributing to heart failure that may become difficult to reverse if the underlying valve problem is not addressed. Severe tricuspid regurgitation in particular has been associated with organ congestion affecting the liver and kidneys, since blood backs up throughout the venous system on the right side of the body.²

Both conditions, when severe and left untreated, are associated with reduced survival compared with mild or moderate regurgitation, which is part of why cardiologists monitor valve function closely once regurgitation is identified, even before symptoms become bothersome.⁴

Treatment

Mild to moderate regurgitation of either valve is frequently managed with regular monitoring alone, since intervention carries risks of its own and may not be warranted until leakage becomes more severe or symptoms develop. Medications can help manage symptoms related to fluid retention or heart rhythm problems, but no medication can repair a structurally damaged valve.¹

For severe primary mitral regurgitation, surgical repair is generally preferred over replacement whenever the valve anatomy allows it, since repair preserves the patient’s own tissue and tends to produce better long term outcomes than replacing the valve with a mechanical or biological substitute.³

For patients who face prohibitive surgical risk, transcatheter edge to edge repair offers a minimally invasive alternative, using a small clip delivered through a catheter to bring the valve leaflets closer together and reduce backward leakage. This technology, first developed for the mitral valve, has more recently been adapted for the tricuspid valve as well, with systems such as TriClip now available for appropriately selected patients with severe tricuspid regurgitation.⁵

Prevention

Because many cases of mitral and tricuspid regurgitation arise secondary to other heart conditions, preventing those underlying conditions offers the most reliable path to reducing valve related risk. Controlling blood pressure, managing atrial fibrillation effectively, and treating heart failure promptly all reduce the chamber enlargement that commonly drives secondary regurgitation.⁴

Prompt treatment of infections that could affect the heart valves, along with good dental hygiene to reduce the risk of bacteria entering the bloodstream, helps prevent valve damage from infective endocarditis, a less common but serious cause of primary valve regurgitation.²

For people already diagnosed with mild regurgitation, regular follow up with echocardiography allows physicians to track any progression over time and intervene before the condition advances to a stage associated with heart failure or reduced survival.¹

Why Visual Communication Matters for Valve Regurgitation

Explaining why a valve leaks, how blood moves backward instead of forward, or how a small clip delivered through a catheter can bring two leaflets together is genuinely difficult using words alone. Patients facing a valve diagnosis often need to see the mechanism clearly before they can meaningfully weigh treatment options with their care team.¹

Device manufacturers, structural heart programs, and patient education teams depend on accurate illustration and animation to explain valve anatomy, the difference between primary and secondary regurgitation, and how repair or replacement procedures work.

• Illustrating normal valve function compared with regurgitant blood flow in the mitral and tricuspid valves
• Animating transcatheter edge to edge repair procedures for both valves
• Explaining the difference between primary and secondary regurgitation for patient education
• Visualizing how chamber enlargement contributes to functional valve regurgitation over time
• Showing surgical repair techniques compared with valve replacement options
• Supporting clinical training on structural heart intervention selection

How Biotic Artlab Supports Valve Regurgitation Communication

We work with structural heart device manufacturers, cardiac surgery programs, and healthcare organizations to create precise, engaging visuals that make valve disease and its treatment options understandable for patients, clinicians, and industry audiences.

• Custom 3D animations of mitral and tricuspid valve anatomy and function
• Detailed illustrations comparing primary and secondary regurgitation mechanisms
• Procedure animations for transcatheter edge to edge repair and surgical valve repair
• Patient facing educational materials explaining diagnosis and treatment pathways
• Clinical training content for structural heart and cardiac surgery teams
• Conference presentations and marketing visuals for valve therapy audiences

Frequently Asked Questions

What is the difference between mitral and tricuspid regurgitation?

Mitral regurgitation affects the valve on the left side of the heart and often produces symptoms related to fluid in the lungs, while tricuspid regurgitation affects the valve on the right side and more commonly produces symptoms similar to right sided heart failure, including leg and abdominal swelling.¹

Can valve regurgitation improve without treatment?

Mild regurgitation can remain stable for years and does not always progress to a stage requiring intervention. However, regurgitation caused by a structural valve problem generally does not improve on its own and requires monitoring to detect any worsening over time.³

Is surgery always required for severe regurgitation?

Not necessarily. For patients at high surgical risk, transcatheter edge to edge repair offers a less invasive alternative that can meaningfully reduce leakage and improve symptoms without open heart surgery.⁵

Why has tricuspid regurgitation been historically undertreated?

The tricuspid valve received comparatively little research and clinical attention for decades, partly because symptoms can be subtle and partly due to limited treatment options. Growing evidence linking significant tricuspid regurgitation to worse outcomes has driven renewed interest in dedicated treatments.²

What causes secondary valve regurgitation?

Secondary regurgitation occurs when the valve itself is structurally normal, but enlargement of the surrounding heart chamber, often due to prior heart attack, heart failure, or atrial fibrillation, prevents the leaflets from closing together properly.⁴

How is valve regurgitation diagnosed?

Echocardiography is the primary tool used to diagnose and grade the severity of valve regurgitation, allowing physicians to visualize blood flow across the valve and measure the size and function of the surrounding heart chambers.¹

Have a Project in Mind? Contact Us.

If you are developing training materials, patient education content, or marketing visuals related to mitral or tricuspid valve regurgitation, our team can help translate the science into visuals that are both accurate and easy to understand. Contact us at info@biotic-artlab.com or get in touch through our contact form to discuss your project.

References

1. American Heart Association. Mitral Valve Regurgitation.
2. National Center for Biotechnology Information. Tricuspid Regurgitation, Remembering the Forgotten Valve.
3. National Center for Biotechnology Information, StatPearls. Mitral Valve Repair.
4. National Center for Biotechnology Information. New Therapeutic Approach for Tricuspid Regurgitation, Transcatheter Tricuspid Valve Replacement or Repair.
5. National Center for Biotechnology Information. Transcatheter Edge to Edge Repair of Tricuspid Regurgitation With TriClip, A Step by Step Guide.

Disclaimer: This page provides general educational information and is not a substitute for diagnosis, treatment, emergency care, or individualized advice from a qualified healthcare professional.