Aortic Valve Regurgitation

Overview

Aortic valve regurgitation is a condition in which the aortic valve does not close completely after each heartbeat. When the left ventricle contracts, it pumps blood into the aorta. A healthy aortic valve then closes tightly, preventing blood from flowing backward. In aortic regurgitation, the valve fails to seal properly and a portion of the blood that has been pumped into the aorta leaks back into the left ventricle.

Because the left ventricle must pump this extra volume of blood with every beat, it gradually becomes overloaded. Initially, the heart compensates and the person may have no symptoms for years or even decades. Over time, however, the sustained overload causes the left ventricle to enlarge. Its walls, initially thickened as a compensatory response, gradually thin and weaken. This progression can lead to heart failure and permanent cardiac damage.

Aortic regurgitation can follow a slowly progressive chronic course, or it can develop suddenly in conditions such as infective endocarditis or aortic dissection. Acute aortic regurgitation is a medical emergency requiring immediate intervention.

Symptoms

Chronic aortic regurgitation may produce no symptoms for a prolonged period. Because the left ventricle can initially compensate for the extra volume, the person may remain asymptomatic for years. Symptoms typically emerge when the left ventricle begins to exceed its compensatory capacity.

• Shortness of breath. This may initially occur only during exertion such as climbing stairs or walking briskly. As left ventricular function declines, breathlessness can also develop at rest or when lying flat. Waking from sleep unable to breathe comfortably is a particularly important sign.
• Palpitations. As the left ventricle enlarges and pumps a greater volume of blood with each beat, the person may notice strong, rapid, or irregular heartbeats. A pronounced pounding sensation in the left side of the chest when lying down can be a characteristic feature of aortic regurgitation.
• Fatigue and weakness. As the heart's pumping efficiency declines, the body receives less blood than it needs and a persistent sense of exhaustion may develop.
• Reduced exercise capacity. Physical activities that were previously manageable may progressively produce fatigue or breathlessness more quickly.
• Swelling in the legs and ankles. As left ventricular failure advances, fluid can accumulate in the body.
• Chest discomfort. Some people may notice a feeling of pressure or tightness in the chest.
• Dizziness. Changes in blood pressure with sudden movements may produce episodes of lightheadedness.

In acute aortic regurgitation, symptoms develop rapidly and dramatically. Because the left ventricle has not had time to adapt to the sudden volume overload, acute heart failure and cardiogenic shock can develop quickly. This is a medical emergency.

When to Seek Medical Care

See a doctor if you notice any of the following.

• Shortness of breath during activity or at rest
• Breathlessness when lying flat that wakes you from sleep
• Unexplained fatigue and a decline in exercise capacity
• Swelling in the legs or ankles
• A pronounced pounding heartbeat felt in the left side of the chest when lying down

Call emergency services immediately if you experience any of the following.

• Sudden and severe shortness of breath
• Sudden, severe chest pain
• Fainting or nearly fainting
• A very rapid or markedly irregular heartbeat

Causes

Aortic regurgitation can arise from several different underlying causes. The cause also largely determines whether the condition follows a chronic or acute course.

• Bicuspid aortic valve. A bicuspid aortic valve, in which the valve has two leaflets instead of the normal three, is one of the most common congenital valve abnormalities. It predisposes to both stenosis and regurgitation, and is frequently associated with dilation of the aortic root.
• Aortic root and ascending aorta dilation. Even when the valve leaflets themselves are structurally normal, if the ring supporting the valve dilates sufficiently, the leaflets can no longer meet in the center and regurgitation develops. Marfan syndrome, bicuspid aortic valve, age-related aortic stiffening, and high blood pressure are among the most important causes of this type of dilation.
• Rheumatic heart disease. Untreated streptococcal throat infections can lead to rheumatic fever, which causes permanent scarring of the aortic valve leaflets. Rheumatic disease can produce both stenosis and regurgitation, and may cause both simultaneously over time.
• Age-related calcification and degeneration. Progressive calcification and stiffening of the valve leaflets can prevent them from closing fully, leading to regurgitation in older adults.
• Infective endocarditis. Bacterial infection of the aortic valve can destroy the leaflets and cause rapidly progressive or sudden regurgitation. Without prompt treatment, this can become a surgical emergency.
• Aortic dissection. When the inner lining of the aorta tears and the dissection involves the aortic root, the support of the valve is disrupted and acute regurgitation can develop. This is a life-threatening emergency.
• Trauma. A severe blunt injury to the chest can damage the aortic valve leaflets or the aortic root.
• Autoimmune conditions. Ankylosing spondylitis and rheumatoid arthritis can cause inflammation of the aortic root and, over time, contribute to valve regurgitation.

Risk Factors

• Bicuspid aortic valve. This congenital anomaly predisposes to earlier and more severe valve disease and requires close lifelong monitoring.
• Marfan syndrome and connective tissue disorders. The risk of aortic root dilation and valve regurgitation is substantially higher in these conditions.
• Uncontrolled high blood pressure. Sustained elevated blood pressure can dilate the aortic root and valve ring, contributing to regurgitation.
• A history of rheumatic fever. Particularly recurrent episodes carry a higher risk of lasting valve damage.
• A prior episode of infective endocarditis. Valve tissue previously damaged by infection carries ongoing risk.
• Older age. Degenerative valve changes increase with age.

Diagnosis

The diagnosis of aortic regurgitation is established through clinical assessment and imaging. Accurately determining the severity and the state of the left ventricle is essential for planning monitoring and timing any intervention correctly.

• Medical history and physical examination. The onset and progression of symptoms are discussed. Aortic regurgitation has several characteristic examination findings. A diastolic murmur — an abnormal sound heard through the stethoscope during the relaxation phase between beats — is the hallmark of aortic regurgitation. A wide pulse pressure, meaning an abnormally large difference between the systolic and diastolic blood pressure readings, is another important sign. In severe cases, visibly bounding pulses in the peripheral arteries may be observed.
• Echocardiogram (heart ultrasound). This is the most important tool for diagnosing and monitoring aortic regurgitation. It shows the structure and closing behavior of the valve leaflets, quantifies the degree of regurgitation, and measures the size of the left ventricle, wall thickness, and ejection fraction. Serial measurements of left ventricular dimensions and function directly guide the timing of surgery. The aortic root and ascending aorta are also routinely measured. Doppler imaging shows the direction and velocity of the backward blood flow.
• Transesophageal echocardiography. This technique, in which an ultrasound probe is passed into the esophagus, provides much more detailed images of the valve leaflets and the aortic root. It is particularly useful when infective endocarditis is suspected, when the anatomy of a bicuspid aortic valve needs detailed assessment, and in surgical planning.
• Cardiac MRI. Provides highly precise measurements of left ventricular volumes and dimensions, and can quantify the volume of regurgitation with accuracy. It plays an increasingly important role in assessing left ventricular function and refining the timing of surgery. It also evaluates the full length of the aortic root and ascending aorta.
• Electrocardiogram (ECG). Can show electrical changes associated with left ventricular enlargement and detect rhythm disturbances. Atrial fibrillation is a late complication of aortic regurgitation.
• CT or MR angiography of the aorta. When the aortic root and ascending aorta are dilated, imaging of the full aorta is important to assess the extent and progression of dilation. Regular monitoring of aortic dimensions is essential in patients with Marfan syndrome and bicuspid aortic valve.
• Exercise stress test. May be used in apparently asymptomatic patients to objectively measure exercise capacity and uncover symptoms that are not recognized at rest. The blood pressure response during exercise can also influence the timing of intervention decisions.
• Coronary angiography or coronary CT angiography. Evaluation of the coronary arteries is required before valve surgery. If significant coronary artery disease is found, bypass surgery can be planned alongside the valve procedure. Coronary assessment is particularly important in patients over 50 and those with cardiovascular risk factors.

Treatment

Treatment of aortic regurgitation depends on the severity of the condition, the state of the left ventricle, and whether symptoms are present. Mild to moderate regurgitation in an asymptomatic patient is managed with medications and regular monitoring. Severe regurgitation requires valve intervention, and the timing of that intervention is critically important.

Watchful Waiting

In patients with mild to moderate aortic regurgitation and no symptoms, the left ventricular size and function are monitored at regular intervals with echocardiography. The timing of intervention is guided by specific thresholds for left ventricular dimensions and ejection fraction. Any new symptoms that develop during this monitoring period should prompt immediate medical attention.

Medications

Medications do not correct the valve abnormality itself. They can, however, reduce the workload on the left ventricle and relieve symptoms.

• Blood pressure medications. Vasodilating drugs, particularly ACE inhibitors, ARBs, and dihydropyridine calcium channel blockers, reduce resistance in the aorta. This means the left ventricle pumps against less opposition with each beat, which can reduce the volume of blood leaking backward. In severe aortic regurgitation, these medications are particularly useful in patients with high blood pressure or in those who are not yet surgical candidates.
• Heart failure medications. When left ventricular function begins to decline, standard heart failure medications are added to the treatment plan. Diuretics relieve breathlessness and swelling by removing excess fluid.
• Managing rhythm disturbances. Atrial fibrillation and other rhythm problems are treated with appropriate medications. When atrial fibrillation is present, anticoagulation therapy is typically required to reduce the risk of stroke.

Surgical and Catheter-Based Treatments

Intervention is indicated in severe aortic regurgitation when symptoms develop or when the left ventricle reaches specific thresholds for size or function. Timing is critical: waiting too long risks permanent left ventricular damage that may not fully recover even after successful valve surgery.

• Aortic valve repair. When anatomically feasible, preserving the patient's own valve through repair is preferred. In certain situations, particularly bicuspid aortic valve anatomy or prolapse-related regurgitation, repair can be performed successfully at experienced centers. Repair avoids the need for lifelong anticoagulation and has excellent outcomes in the right hands. Not all patients are suitable candidates, however, and the decision depends on anatomy and surgical expertise.
• Biological valve replacement. A valve derived from animal or human donor tissue provides natural flow characteristics and does not require long-term anticoagulation. These valves gradually deteriorate over time and may need replacement after ten to twenty years. They are generally preferred in older patients or in those who cannot safely take long-term anticoagulation.
• Mechanical valve replacement. Extremely durable and rarely requires re-replacement. Because of the clotting risk, lifelong warfarin anticoagulation is mandatory. Generally preferred in younger patients who can reliably manage long-term anticoagulation.
• Ross procedure. A surgical option considered particularly in younger patients. The patient's own pulmonary valve is transferred to the aortic position, and a biological or homograft valve is placed in the pulmonary position. This avoids lifelong anticoagulation but involves two valve interventions in a single operation and is technically complex. It is performed at specialized centers.
• Aortic root and ascending aorta surgery. When dilation of the aortic root or ascending aorta accompanies the valve regurgitation, the dilated segment of the aorta must also be replaced. Valve-sparing aortic root replacement allows the aortic root to be reconstructed while preserving the patient's own valve leaflets in selected patients.
• Transcatheter aortic valve implantation (TAVI). TAVI is conventionally used for aortic stenosis. Its application to aortic regurgitation is technically more challenging and is an evolving area. In selected patients with very high surgical risk, newer-generation devices are being used for this purpose. Discuss with your cardiologist whether this might be an appropriate option in your specific situation.

Complications

Untreated or inadequately monitored aortic regurgitation can lead to serious complications over time.

• Permanent left ventricular damage. Prolonged volume overload causes progressive enlargement and eventual weakening of the left ventricle. Beyond a certain threshold, this damage may not fully reverse even after successful valve surgery. This is why the timing of intervention is so critical.
• Heart failure. Advanced left ventricular damage can evolve into chronic heart failure that persists even after valve replacement.
• Atrial fibrillation. Enlargement of the left ventricle and left atrium can predispose to atrial fibrillation, which both worsens symptoms and increases stroke risk.
• Aortic root enlargement and dissection risk. Particularly in patients with Marfan syndrome or a bicuspid aortic valve, failure to adequately monitor aortic dimensions can allow dangerous enlargement to develop, increasing the risk of aortic dissection.
• Infective endocarditis. The regurgitant valve surface provides a site where bacteria can settle and cause infection, which can rapidly worsen the degree of valve damage.

Lifestyle

Living with aortic regurgitation requires a long-term commitment to monitoring and several important considerations in daily life.

Physical Activity

Many people with mild to moderate regurgitation and no symptoms can maintain a near-normal level of physical activity. In severe aortic regurgitation, vigorous exercise and competitive sport increase the workload on the left ventricle. Isometric exercise, such as heavy weightlifting, is of particular concern because it raises aortic pressure substantially. The type and intensity of activity that is appropriate should be determined by your cardiologist rather than based on how you feel.

Blood Pressure Control

Elevated blood pressure directly worsens aortic regurgitation by increasing the resistance the left ventricle pumps against. Keeping blood pressure within target values reduces the left ventricular workload and may help slow further aortic dilation. Regular home blood pressure monitoring and keeping a record to share at appointments helps your doctor guide treatment effectively.

Medications

Taking prescribed medications consistently and not stopping them without medical guidance is essential. After surgery, the medication regimen changes based on the type of valve implanted. Patients with a mechanical valve must manage warfarin therapy carefully, with regular INR monitoring. Always inform any other treating doctor about your valve condition and medications before a new drug is started.

Protecting Against Infective Endocarditis

Some patients with aortic regurgitation are advised to take antibiotics before dental procedures and certain surgeries to reduce the risk of valve infection. Inform your dentist and every treating healthcare professional about your valve condition. Good oral hygiene is also an important protective measure.

Patients with Marfan Syndrome or a Bicuspid Aortic Valve

In these patients, the aortic root and ascending aorta require regular measurement alongside the valve itself. When the aortic diameter reaches certain thresholds, surgical intervention may be recommended even in the absence of symptoms. A family history of Marfan syndrome or aortic dissection should prompt evaluation of first-degree relatives.

Regular Follow-up

Aortic regurgitation requires regular echocardiography and cardiology review. The frequency of follow-up depends on the severity of the condition. Mild regurgitation is typically monitored every two to five years, moderate regurgitation every one to two years, and severe regurgitation annually or more frequently. Do not wait for a scheduled appointment if new symptoms develop. Contact your doctor or seek emergency care if any of the following occur.

• Shortness of breath that returns or worsens
• Difficulty breathing when lying flat
• Swelling in the legs or ankles
• Chest pain or pressure
• Fainting or nearly fainting
• Fever with sweating and fatigue, which may suggest a valve infection

Preparing for Your Appointment

Coming prepared to an appointment for aortic valve regurgitation helps your doctor make a more accurate assessment and choose the most appropriate treatment for you.

What You Can Do

• Write down when symptoms began and how they have progressed.
• Bring any previous echocardiography reports. Left ventricular dimensions and ejection fraction values are particularly important.
• Mention any family history of Marfan syndrome, bicuspid aortic valve, or aortic disease.
• Share any history of rheumatic fever or infective endocarditis.
• List all medications, supplements, and herbal products you are taking.
• Mention any upcoming dental procedures or surgical plans.
• Write your questions down before the appointment.

Questions You May Wish to Ask Your Doctor

• How severe is my regurgitation?
• What is the current state of my left ventricle and has it enlarged?
• Do I need surgery or another intervention now, or is monitoring sufficient?
• What is the state of my aortic root?
• Would valve repair or replacement be more appropriate?
• Would you recommend a biological or mechanical valve?
• What type and intensity of exercise is safe for me?
• Do I need to take antibiotics before dental treatment?
• How often do I need follow-up appointments?

Questions Your Doctor May Ask You

• When did symptoms begin and how have they progressed?
• Do you experience breathlessness when lying flat or during exertion?
• Is there a family history of Marfan syndrome, bicuspid aortic valve, or aortic disease?
• Have you had rheumatic fever or a valve infection in the past?
• What medications are you currently taking?
• Have you noticed any changes in your exercise capacity?
• Do you have high blood pressure and is it well controlled?