Aortic Stenosis

Aortic stenosis is a heart valve disease in which the aortic valve becomes narrowed, making it harder for blood to leave the heart and flow to the body. It can be mild for many years, but moderate or severe aortic stenosis needs careful specialist monitoring and, in some cases, valve replacement.

Overview

Aortic stenosis is a condition in which the aortic valve, one of the main valves of the heart, becomes narrowed and does not open fully. The aortic valve sits between the left ventricle, the heart’s main pumping chamber, and the aorta, the large artery that carries oxygen-rich blood to the body. When this valve is narrowed, blood flow is restricted and the heart has to generate more pressure to push blood forward.

Aortic stenosis is a form of heart valve disease. It may develop slowly over many years, especially when it is related to age-associated calcium deposits on the valve. Some people are born with an aortic valve that has two leaflets instead of three, called a bicuspid aortic valve, which can increase the risk of earlier narrowing. Less commonly, aortic stenosis can follow rheumatic fever or other inflammatory valve conditions.

The condition is often described as mild, moderate, or severe, depending on how narrow the valve is and how it affects blood flow and heart function. Mild disease may only require regular monitoring. Severe aortic stenosis, especially when symptoms are present, is a serious medical condition that should be evaluated by a cardiologist or heart valve team. With modern imaging and treatment options, care can be planned safely and individually.

Symptoms

Aortic stenosis may not cause symptoms in its early stages. Many people first learn they may have valve disease when a doctor hears a heart murmur during a routine examination. As the valve becomes more narrowed, the heart may struggle to increase blood flow during activity, and symptoms can begin gradually.

Common aortic stenosis symptoms include breathlessness during exertion, chest tightness or discomfort, dizziness, fainting or near-fainting, unusual fatigue, and reduced ability to exercise. Some people notice they need to slow down, rest more often, or avoid hills and stairs. Symptoms may be subtle at first and may be mistaken for normal aging or reduced fitness.

Possible symptoms and signs include:

• Shortness of breath with activity or, in advanced cases, at rest
• Chest pain, pressure, or tightness, especially with exertion
• Lightheadedness, fainting, or feeling close to fainting
• Palpitations or awareness of the heartbeat
• Swelling of the ankles or feet if heart failure develops
• Reduced stamina or feeling unusually tired

Symptoms are important because they help guide the urgency of specialist assessment. A person with known aortic stenosis should not ignore new breathlessness, chest discomfort, or fainting. These symptoms can indicate that the valve narrowing is affecting the heart and circulation more significantly.

Causes & Risk Factors

The most common cause of aortic stenosis in older adults is gradual thickening and calcification of the aortic valve. Over time, calcium can build up on the valve leaflets, making them stiff and less able to open properly. This process is not the same as calcium in the diet; it is a degenerative change in the valve tissue and is influenced by several health and genetic factors.

A bicuspid aortic valve is another important cause. In this congenital condition, the valve has two leaflets instead of the usual three. A bicuspid valve may function well for years, but it is more prone to narrowing, leaking, or calcification. It may also be associated with enlargement of the aorta, so people with this diagnosis often need periodic imaging even before symptoms appear.

Risk factors and associated conditions may include:

• Older age
• Bicuspid aortic valve or family history of valve disease
• Previous rheumatic fever or rheumatic heart disease
• High blood pressure or other cardiovascular risk factors
• Chronic kidney disease
• Previous chest radiotherapy
• Certain inherited or congenital heart conditions

Having risk factors does not mean a person will definitely develop aortic stenosis. However, risk factors can influence how closely a person should be monitored. A cardiologist can assess the valve, the heart muscle, and the aorta to determine whether follow-up is needed and how often it should occur.

Diagnosis

Aortic stenosis is often suspected after a clinician hears a characteristic heart murmur through a stethoscope. A murmur is a sound created by turbulent blood flow across the narrowed valve. A physical examination may also identify changes in pulse quality or signs of strain on the heart, but imaging is required to confirm the diagnosis and measure severity.

Echocardiography, or ultrasound of the heart, is the main diagnostic test for aortic stenosis. It shows the structure and movement of the aortic valve, estimates how narrow the valve is, measures blood flow speed, and assesses the pumping function of the left ventricle. Echocardiography can also detect related valve problems and estimate whether pressure is building up in the heart or lungs.

Additional tests may be used depending on the person’s symptoms, age, overall health, and treatment planning needs. These may include an electrocardiogram to assess heart rhythm, chest imaging, exercise testing in carefully selected people without symptoms, computed tomography to evaluate valve calcification or the aorta, and cardiac catheterization when more detailed information about the heart arteries or pressures is needed.

Diagnosis is not only about naming the condition. It is also about understanding whether aortic stenosis is mild, moderate, or severe; whether symptoms are related to the valve; and whether the heart is adapting well. This information helps the specialist decide whether monitoring, medication for associated conditions, or valve intervention should be considered.

Treatment Options

Treatment for aortic stenosis depends on the severity of the narrowing, the presence of symptoms, heart function, age, other medical conditions, and personal treatment goals. The right approach should be decided by a cardiologist and, when appropriate, a multidisciplinary heart valve team after a full assessment. There is no single plan that is suitable for everyone.

For mild or moderate aortic stenosis, treatment often involves regular follow-up with echocardiography and management of general cardiovascular health. This may include careful control of blood pressure, treatment of rhythm problems if they occur, heart-healthy lifestyle measures, and review of symptoms over time. Medicines can help treat associated conditions such as high blood pressure, heart failure symptoms, or abnormal heart rhythms, but medicines do not mechanically open a severely narrowed valve.

When aortic stenosis is severe and causing symptoms, or when it significantly affects heart function, valve replacement may be considered. The two main categories are surgical aortic valve replacement and transcatheter aortic valve implantation, also called TAVI or TAVR. Surgical replacement is performed through an operation, while transcatheter treatment places a replacement valve through blood vessels, usually without opening the chest in the same way as conventional surgery. Suitability depends on anatomy, surgical risk, valve features, the aorta, other heart disease, and patient-specific factors.

Some people may need additional procedures, such as treatment of coronary artery disease, at the same time as valve therapy. Rehabilitation and follow-up are also important parts of care after any intervention. A specialist team explains the expected benefits, possible risks, recovery process, and long-term monitoring before treatment decisions are made.

Living With / Prognosis

Living with aortic stenosis depends greatly on how severe the valve narrowing is and whether symptoms are present. Many people with mild disease live normally with periodic check-ups. Others may need closer monitoring if the valve is moderately narrowed, the heart is changing in size or function, or symptoms are uncertain. Keeping scheduled cardiology appointments is important because aortic stenosis can progress slowly and silently.

People diagnosed with aortic stenosis are usually advised to report any change in exercise capacity, breathlessness, chest discomfort, dizziness, or fainting. Activity recommendations should be individualized. Some patients can continue regular moderate activity, while others with severe disease or symptoms may need to avoid strenuous exertion until they are reviewed by a cardiologist.

General heart-health measures can support overall wellbeing. These include not smoking, maintaining a healthy weight, following medical advice for blood pressure and cholesterol, managing diabetes if present, and seeking dental care to reduce the risk of infections that can affect heart valves. Patients should tell dentists and doctors that they have valve disease or a replacement valve, as this may affect preventive care decisions.

The outlook for aortic stenosis has improved because diagnosis is more accurate and valve treatments are available for many different patient profiles. Prognosis is best discussed with a specialist who can interpret the severity of the valve narrowing, the heart’s response, and the person’s overall health. Individual outcomes vary, and regular follow-up helps ensure that treatment is considered at the right time.

When to See a Doctor

A person should see a doctor if they develop breathlessness with exertion, chest pressure, unexplained fatigue, dizziness, fainting, or a noticeable decline in exercise ability. These symptoms can have many causes, but they should be evaluated promptly, especially in someone with a heart murmur, known valve disease, or a family history of bicuspid aortic valve.

People already diagnosed with aortic stenosis should attend regular cardiology follow-up even if they feel well. Aortic stenosis can worsen before symptoms become obvious, and echocardiography helps track changes. New or worsening symptoms should be reported without waiting for the next routine appointment.

Urgent medical care is appropriate for severe chest pain, fainting, severe shortness of breath, or symptoms that occur suddenly or at rest. These symptoms do not always mean aortic stenosis is the cause, but they require prompt assessment to protect heart health and identify the correct treatment pathway.

International patients may seek evaluation in centers with coordinated cardiology, cardiac imaging, interventional cardiology, and cardiac surgery services. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat aortic stenosis for international patients, with treatment decisions made after individualized assessment.

Frequently asked questions

What is aortic stenosis?

Aortic stenosis is narrowing of the aortic valve, the valve that allows blood to leave the heart and enter the aorta. When the valve does not open fully, the heart must work harder to pump blood to the body. Severity ranges from mild to severe and is assessed with heart imaging, especially echocardiography.

What are the first symptoms of aortic stenosis?

Early aortic stenosis often causes no symptoms. When symptoms develop, they may include shortness of breath with activity, chest discomfort, dizziness, fainting, fatigue, or reduced exercise tolerance. Any new symptoms in a person with known valve disease should be discussed with a doctor.

Can aortic stenosis be treated with medication?

Medication may help manage related conditions such as high blood pressure, fluid retention, or rhythm problems. However, medicines do not open a severely narrowed aortic valve. If severe aortic stenosis is causing symptoms or affecting heart function, a specialist may consider valve replacement options.

How is aortic stenosis diagnosed?

Aortic stenosis is often suspected when a doctor hears a heart murmur. The main test is echocardiography, which uses ultrasound to show the valve, measure blood flow, and assess heart function. Other tests may be added if the specialist needs more information for treatment planning.

Is aortic stenosis the same as a heart attack?

No. Aortic stenosis is a heart valve problem, while a heart attack is usually caused by blocked blood flow in a coronary artery. However, both conditions can cause chest discomfort or breathlessness, so symptoms should be assessed by a qualified medical professional.

When does aortic stenosis need valve replacement?

Valve replacement may be considered when aortic stenosis is severe and causes symptoms, or when it significantly affects the heart even if symptoms are limited. The decision depends on imaging results, overall health, anatomy, surgical risk, and patient preferences. A cardiologist or heart valve team determines the most appropriate approach after assessment.

Can someone with aortic stenosis exercise?

Exercise advice depends on the severity of aortic stenosis and whether symptoms are present. Many people with mild disease can remain active, but strenuous activity may be unsafe for some people with severe or symptomatic disease. Patients should ask their cardiologist for individualized activity guidance.

References

• European Society of Cardiology
• American Heart Association
• American College of Cardiology
• National Heart, Lung, and Blood Institute
• Mayo Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.