Aortic Stenosis

Aortic stenosis is a heart condition where the aortic valve, one of the heart's four valves, narrows and stiffens. This narrowing restricts blood flow from your heart to your body, making the heart work harder. It can lead to symptoms like chest pain, shortness of breath, and fainting, and often requires monitoring or valve replacement.

What is Aortic Stenosis?

Aortic stenosis is a heart condition where the aortic valve, one of the heart's four valves, becomes stiff and narrow. This narrowing makes it harder for your heart to pump oxygen-rich blood from its main pumping chamber (left ventricle) to your body. Over time, this extra effort can weaken the heart muscle.

Your heart has four valves that act like one-way doors, ensuring blood flows in the correct direction. The aortic valve is located between your heart's main pumping chamber, called the left ventricle, and the body's largest artery, the aorta. Its job is to open wide with each heartbeat, allowing oxygen-rich blood to flow out to your body, and then close tightly to prevent blood from flowing backward. (Mayo Clinic, MedlinePlus) When you have aortic stenosis, this valve narrows and may not open fully. This means your heart has to pump much harder to push blood through the smaller opening. Imagine trying to push water through a pinched hose; it takes more effort. Over time, this increased workload can cause the left ventricle to thicken and enlarge, eventually weakening the heart muscle. (Mayo Clinic, MedlinePlus) Aortic stenosis can range from mild to severe. In mild cases, the narrowing is slight, and your heart can usually compensate without significant issues. However, as the condition progresses and the narrowing becomes more severe, it can significantly impact your heart's ability to supply blood to your body, leading to symptoms and potential complications. (Mayo Clinic, MedlinePlus)

Symptoms

In its early stages, aortic stenosis often causes no symptoms. As the condition worsens, you might experience chest pain (angina), shortness of breath, especially with activity, dizziness, or fainting spells. Other signs can include fatigue, heart palpitations, or a heart murmur heard by a doctor.

Many people with mild or even moderate aortic stenosis do not experience any symptoms for a long time. The heart is very good at compensating for the narrowing valve by working harder. Symptoms usually appear when the narrowing becomes severe enough to significantly reduce blood flow or strain the heart muscle. (Mayo Clinic, MedlinePlus) Common symptoms include chest pain, often called angina, which may feel like pressure or tightness in your chest. You might also notice shortness of breath (dyspnea), especially when you are active or lying flat. Dizziness or fainting spells (syncope) can occur because your brain isn't getting enough blood flow, particularly during exertion. (Mayo Clinic, MedlinePlus) Other signs and symptoms can include feeling unusually tired or weak (fatigue), noticing a fluttering or pounding in your chest (heart palpitations), or swelling in your ankles and feet. A doctor might also detect a distinct whooshing sound, known as a heart murmur, when listening to your heart with a stethoscope, which is often the first sign of aortic stenosis. (Mayo Clinic, MedlinePlus)

Causes & risk factors

Aortic stenosis is most commonly caused by age-related wear and tear on the aortic valve, leading to calcium buildup. Other causes include a birth defect where the valve has two flaps instead of three (bicuspid aortic valve) or rheumatic fever. Risk factors include older age, high blood pressure, high cholesterol, and smoking.

The most common cause of aortic stenosis is the buildup of calcium deposits on the valve flaps over many years. This process, called calcific aortic valve disease, is similar to how calcium can build up in arteries and is often associated with aging. As calcium accumulates, the valve becomes stiff and narrow, making it harder for it to open fully. (Mayo Clinic, MedlinePlus) Another significant cause is a bicuspid aortic valve, a congenital heart defect meaning you are born with it. Normally, the aortic valve has three small flaps (leaflets). With a bicuspid valve, you have only two. This abnormal structure can cause the valve to narrow or leak over time, sometimes as early as childhood, but often not until adulthood. (Mayo Clinic, MedlinePlus) Less commonly, aortic stenosis can result from rheumatic fever, a complication of untreated strep throat. Rheumatic fever can damage heart valves, causing them to scar and narrow years later. While rare in the United States today, it remains a cause in other parts of the world. (Mayo Clinic, MedlinePlus) Several factors can increase your risk of developing aortic stenosis. These include older age, having high blood pressure (hypertension), high cholesterol, and smoking. Other risk factors are diabetes, chronic kidney disease, and a history of radiation therapy to the chest. These conditions can contribute to the wear and tear and calcium buildup on the valve. (Mayo Clinic, MedlinePlus)

How it's diagnosed

Aortic stenosis is often first suspected when a doctor hears a heart murmur during a routine physical exam. To confirm the diagnosis and assess its severity, an echocardiogram (an ultrasound of the heart) is the primary test. Other tests like an electrocardiogram (ECG), chest X-ray, or cardiac CT scan may also be used.

The first indication of aortic stenosis is often a heart murmur, a distinct whooshing sound heard through a stethoscope as blood flows turbulently through the narrowed valve. Your doctor may also notice other signs during a physical exam, such as a weak pulse or changes in your blood pressure. (Mayo Clinic, MedlinePlus) The most important test for diagnosing aortic stenosis and determining its severity is an echocardiogram. This non-invasive test uses sound waves to create moving pictures of your heart. It allows your doctor to see the aortic valve's structure, how well it opens and closes, how fast blood flows through it, and how effectively your heart is pumping. (Mayo Clinic, MedlinePlus) Other tests may be used to gather more information. An electrocardiogram (ECG) records the electrical signals of your heart and can show if your heart's pumping chambers are enlarged. A chest X-ray can reveal calcium deposits on the valve or an enlarged heart. In some cases, a cardiac CT scan or MRI may provide more detailed images of the valve and aorta. If your symptoms occur with activity, a stress test might be performed to evaluate your heart's function under exertion. (Mayo Clinic, MedlinePlus)

Treatment options

Treatment for aortic stenosis depends on its severity and your symptoms. For mild cases, watchful waiting with regular monitoring is common. For severe cases, especially with symptoms, valve replacement surgery is typically recommended. This can be done through open-heart surgery or a less invasive procedure called transcatheter aortic valve replacement (TAVR).

For people with mild or moderate aortic stenosis who do not have symptoms, doctors usually recommend watchful waiting. This involves regular check-ups and echocardiograms to monitor the condition's progression. Lifestyle changes, such as a heart-healthy diet and managing risk factors like high blood pressure and cholesterol, are also important. Medications may be prescribed to manage symptoms like fluid retention or high blood pressure, but they cannot fix the narrowed valve itself. (Mayo Clinic, MedlinePlus) Once aortic stenosis becomes severe and causes symptoms, or if it significantly affects heart function, aortic valve replacement is typically recommended. This is the only effective treatment to correct the narrowed valve. There are two main approaches for valve replacement. Surgical aortic valve replacement (SAVR) is an open-heart surgery where the damaged valve is removed and replaced with a new mechanical or biological (tissue) valve. (Mayo Clinic, MedlinePlus, Cochrane Library) A less invasive option is transcatheter aortic valve replacement (TAVR), also known as transcatheter aortic valve implantation (TAVI). In this procedure, a new valve is delivered to the heart through a catheter, usually inserted into an artery in the leg or chest. TAVR is often recommended for people who are at higher risk for traditional open-heart surgery due to age or other health conditions. Your doctor will discuss which type of valve and procedure is best for your individual situation. (Mayo Clinic, MedlinePlus, Cochrane Library) In rare cases, particularly for children or as a temporary measure, a balloon valvuloplasty might be performed. This procedure uses a balloon to widen the narrowed valve. However, the valve often narrows again, so it is not a long-term solution for most adults with aortic stenosis. (Mayo Clinic, MedlinePlus)

Recovery & outlook

Recovery after aortic valve replacement can take several weeks to months, depending on the procedure. With successful treatment, many people experience significant improvement in symptoms and quality of life. Without treatment, severe aortic stenosis can lead to serious complications, including heart failure, and has a poor outlook.

Recovery time after aortic valve replacement varies significantly depending on the type of procedure. If you undergo traditional open-heart surgery (SAVR), recovery can take several weeks to a few months. For the less invasive TAVR procedure, recovery is generally shorter, often allowing you to return home within a few days to a week. Your doctor will provide specific guidance on activity levels and rehabilitation during your recovery. (Mayo Clinic) With successful aortic valve replacement, many people experience a dramatic improvement in their symptoms, such as reduced chest pain and shortness of breath, and an improved quality of life. The heart's function can also improve as the strain on it is relieved. You will need ongoing medical follow-up, including regular check-ups and possibly echocardiograms, to monitor your new valve and overall heart health. (Mayo Clinic, MedlinePlus, Cochrane Library) It is important to understand that severe aortic stenosis is a progressive condition. If left untreated, it can lead to serious complications, including heart failure, an irregular heartbeat (arrhythmia), and even sudden cardiac death. The outlook for severe, symptomatic aortic stenosis without treatment is generally poor. Therefore, timely diagnosis and appropriate treatment are crucial for a better prognosis. (Mayo Clinic, MedlinePlus) Maintaining a heart-healthy lifestyle after treatment is also important. This includes eating a balanced diet, engaging in regular physical activity as advised by your doctor, managing blood pressure and cholesterol, and avoiding smoking. These steps can help support your overall heart health and potentially slow the progression of any future valve issues. (Mayo Clinic)

When to see a doctor

You should see a doctor if you experience new or worsening symptoms such as chest pain, shortness of breath, dizziness, or fainting spells. These could be signs of worsening aortic stenosis or other serious heart conditions. Seek immediate medical attention for sudden, severe chest pain, extreme shortness of breath, or loss of consciousness.

If you have been diagnosed with aortic stenosis, it is important to contact your doctor if you notice any new or worsening symptoms. This includes an increase in chest pain, shortness of breath, dizziness, or fatigue. Also, report any new occurrences of heart palpitations or swelling in your ankles and feet. These changes could indicate that your condition is progressing and may require a re-evaluation of your treatment plan. (Mayo Clinic, MedlinePlus) Even if you have not been diagnosed with aortic stenosis, you should see a doctor if you develop any of the symptoms mentioned above. These symptoms can be signs of various heart conditions, and prompt medical evaluation is important for an accurate diagnosis and appropriate management. (Mayo Clinic, MedlinePlus) **Seek immediate medical attention by calling emergency services (like 911 in the US) if you experience:** * Sudden, severe chest pain that spreads to your arm, neck, or jaw. * Extreme shortness of breath, especially if it comes on suddenly or makes it hard to breathe while resting. * Sudden loss of consciousness or fainting. * Severe dizziness or lightheadedness that does not quickly resolve. These could be signs of a medical emergency, including a heart attack or severe heart failure, which require urgent care. (Mayo Clinic, MedlinePlus)

Frequently asked questions

Can aortic stenosis be prevented?

While age-related calcification of the aortic valve cannot be entirely prevented, you can reduce your risk and potentially slow the progression of aortic stenosis. This involves managing risk factors such as high blood pressure (hypertension), high cholesterol, and diabetes, as well as avoiding smoking. (Mayo Clinic, MedlinePlus)

What is the difference between a mechanical and a biological valve?

Mechanical valves are made from durable synthetic materials and are designed to last a lifetime, but they require you to take blood-thinning medication for the rest of your life to prevent blood clots. Biological (tissue) valves are made from animal tissue (pig, cow, or human) and generally do not require lifelong blood thinners, but they may wear out over 10-15 years and need replacement. (Mayo Clinic, MedlinePlus)

How often do I need check-ups if I have mild aortic stenosis?

If you have mild aortic stenosis and no symptoms, your doctor will likely recommend regular monitoring. This usually includes a physical exam and an echocardiogram every 1 to 5 years, depending on the specific characteristics of your valve and your overall health. (Mayo Clinic)

Can I exercise with aortic stenosis?

Your ability to exercise safely depends on the severity of your aortic stenosis and your symptoms. For mild cases, moderate physical activity may be appropriate. However, if you have severe aortic stenosis, especially with symptoms, strenuous activity is usually restricted to prevent complications. Always consult your doctor for personalized advice on safe activity levels. (Mayo Clinic, MedlinePlus)

What are the risks of aortic valve replacement surgery?

Like any major medical procedure, aortic valve replacement carries risks. These can include bleeding, infection, stroke, heart attack, kidney problems, and issues with the new valve. Your doctor will discuss the specific risks and benefits of the procedure, considering your individual health status and the type of replacement chosen. (Mayo Clinic, MedlinePlus)

Is aortic stenosis always serious?

Not always. Mild aortic stenosis may not cause symptoms for many years and might never progress to a severe stage. However, it is a progressive condition that requires monitoring. Severe aortic stenosis, if left untreated, can lead to serious complications like heart failure and can be life-threatening. (Mayo Clinic, MedlinePlus)

Sources

• MedlinePlus — Aortic Stenosis
• Mayo Clinic — Aortic Stenosis
• Cochrane Library — Aortic Stenosis