Aortic Valve Calcification
Aortic valve calcification is a buildup of calcium within the leaflets of the aortic valve, the valve between the left ventricle and the aorta. Mild calcification is common with aging and may cause no symptoms, but more advanced calcification can stiffen the valve and lead to aortic stenosis—a narrowing that limits blood flow out of the heart. Imaging—particularly echocardiography and cardiac CT—is used to detect calcification, measure its severity, and assess valve function. Identifying calcification early provides an opportunity to monitor for progression and address cardiovascular risk factors.
What is it?
The aortic valve is one of four heart valves. It sits between the left ventricle (the heart’s main pumping chamber) and the aorta (the large artery that carries blood to the rest of the body). The valve has three thin leaflets (cusps) that open with each heartbeat to let blood flow forward and close to prevent it from flowing back. Over time, calcium can build up within the leaflets of the aortic valve—a process called aortic valve calcification. Mild calcification is a very common finding, particularly with age, while more advanced calcification can stiffen the leaflets and narrow the valve opening.
Aortic valve calcification is driven by an active biological process, not simply “wear and tear.” It involves inflammation, abnormal cholesterol and calcium handling, and changes in valve tissue cells that resemble the development of atherosclerosis in arteries. The major risk factors for aortic valve calcification overlap with those for coronary artery disease and include older age, male sex, high blood pressure, high cholesterol, diabetes, smoking, obesity, chronic kidney disease, and family history. Bicuspid aortic valve—a common congenital condition in which the valve has two leaflets instead of three—is associated with earlier and more rapid calcification, often producing significant valve disease at younger ages than in patients with normal three-leaflet valves. Prior chest radiation and certain rare metabolic conditions can also contribute.
Aortic valve calcification exists on a spectrum. Aortic sclerosis is the mildest form, in which the valve is thickened or calcified but does not significantly limit blood flow. Many patients with aortic sclerosis remain stable for years, though it is associated with increased cardiovascular risk overall. As calcification progresses, the valve may begin to narrow and obstruct blood flow, producing aortic stenosis, which is graded as mild, moderate, or severe based on imaging findings. Severe aortic stenosis is one of the most important valve conditions in older adults and may eventually require valve replacement.
Most patients with mild aortic valve calcification have no symptoms, and the finding is identified incidentally on echocardiography, cardiac CT, or chest CT performed for other reasons. As calcification advances and stenosis develops, symptoms may begin to appear—typically with exertion or stress. The classic triad of severe aortic stenosis is shortness of breath, chest pain or pressure, and fainting (syncope), particularly with activity. Other symptoms can include reduced exercise tolerance, fatigue, palpitations, and signs of heart failure. Because the heart can compensate for a long time, severe aortic stenosis may not produce significant symptoms until the disease is advanced; even subtle changes in exercise tolerance can be important and warrant evaluation.
Evaluation typically begins with a careful history, physical examination (including listening for a heart murmur), and echocardiography. Transthoracic echocardiography is the central imaging test for assessing valve structure, the degree of calcification, leaflet motion, valve area, gradients across the valve, and overall heart function. Cardiac CT is highly accurate at quantifying aortic valve calcium (often expressed as an Agatston-like score) and is particularly helpful in cases where echocardiographic findings are ambiguous or when planning for transcatheter aortic valve replacement (TAVR). Cardiac MRI can provide additional information about chamber sizes, function, and valve flow. Stress testing may help clarify symptom significance, particularly when symptoms and resting findings do not align. Cardiac catheterization may be performed before planned procedures to assess coronary arteries and confirm valve hemodynamics.
Important to Know
Management of aortic valve calcification depends on its severity, whether it is causing significant valve dysfunction, and the patient’s overall cardiovascular risk. Mild calcification without significant stenosis generally does not require specific valve-directed treatment. Instead, the focus is on managing cardiovascular risk factors, optimizing overall heart health, and monitoring the valve over time with periodic imaging.
Important measures include control of blood pressure, cholesterol, diabetes, and weight; not smoking; regular physical activity; a heart-healthy diet; limited alcohol; treatment of sleep apnea when present; and treatment of any associated coronary artery disease. While statins and other lipid-lowering medications have not been shown to significantly slow the progression of established aortic valve calcification in clinical trials, they remain important for cardiovascular risk reduction in many patients.
For moderate and severe aortic valve calcification with significant stenosis, ongoing monitoring is more intensive, and patients are educated to recognize symptoms that may signal progression. Once severe aortic stenosis becomes symptomatic—or develops other high-risk features—valve replacement is generally recommended because the outlook with conservative management alone is unfavorable. Two main options are available: surgical aortic valve replacement (SAVR), which involves open-heart surgery to remove the diseased valve and replace it with a mechanical or biological prosthesis, and transcatheter aortic valve replacement (TAVR), in which the new valve is delivered via a catheter, usually through an artery in the leg. The choice between SAVR and TAVR depends on age, anatomy, surgical risk, comorbidities, and patient preferences and is made by a multidisciplinary heart valve team.
Care is typically coordinated by primary care clinicians, cardiologists, and, when needed, cardiothoracic surgeons and interventional or structural cardiologists. Imaging findings are interpreted alongside the patient’s symptoms, examination, and broader clinical context rather than in isolation.
Patients with bicuspid aortic valve or strong family histories of aortic disease may also benefit from imaging of the aorta, since aortic dilation and other vessel changes are commonly associated. First-degree relatives of patients with bicuspid aortic valve are often advised to undergo screening echocardiography.
Red flag symptoms include severe or worsening shortness of breath, chest pain or pressure (especially with exertion), fainting or near-fainting (especially with activity), severe palpitations or rapid heart rate with lightheadedness, signs of heart failure with severe leg swelling or sudden weight gain, or sudden collapse. These warrant prompt or urgent medical evaluation.