What is Bicuspid Aortic Valve

Bicuspid Aortic Valve (BAV) is a congenital heart condition where the aortic valve, which normally has three leaflets, develops with only two. This structural difference can cause the valve to narrow (stenosis) or leak (regurgitation) over time, and it is the most common congenital heart defect, affecting approximately 1% to 2% of the general population.

What exactly is a Bicuspid Aortic Valve?

In a healthy heart, the aortic valve acts as a one-way door between the heart and the rest of the body, consisting of three thin flaps called leaflets. In Bicuspid Aortic Valve, two of these leaflets are fused together during fetal development, resulting in a valve with only two leaflets. While many people live their entire lives without realizing they have a Bicuspid Aortic Valve, the abnormal shape can cause turbulent blood flow, leading to premature wear and tear on the valve tissue.

Which body systems are affected by Bicuspid Aortic Valve?

The primary system affected is the cardiovascular system. Because the valve may not open or close perfectly, the heart must work harder to pump blood. Over time, this can lead to:

• Aortic Stenosis: The valve becomes stiff and narrow, restricting blood flow.


• Aortic Regurgitation: The valve fails to close tightly, causing blood to leak backward into the heart.


• Aortopathy: Individuals with Bicuspid Aortic Valve are at a higher risk for dilation (widening) of the aorta, the body’s main artery.

How common is Bicuspid Aortic Valve?

Bicuspid Aortic Valve is remarkably common for a congenital condition, with an estimated prevalence of 13 per 1,000 live births. It is found in men more frequently than in women, with a ratio of approximately 3:1. Because it is a genetic condition, it often runs in families, and first-degree relatives of those diagnosed with Bicuspid Aortic Valve are often recommended to undergo screening.

How does Bicuspid Aortic Valve differ from other heart defects?

Unlike many other congenital heart defects that are identified at birth, Bicuspid Aortic Valve is often "silent" during childhood. It is frequently diagnosed in adulthood when a doctor hears a heart murmur or detects an abnormality during an echocardiogram. It is distinct from other valvular diseases because its progression is tied to both the mechanical stress of the two-leaflet structure and underlying genetic factors that affect connective tissue health.

Next steps

• Schedule an appointment with a cardiologist for a baseline echocardiogram.


• Join our community at DiseaseMaps.org to connect with 142 other members currently managing Bicuspid Aortic Valve.


• Discuss family screening with a genetic counselor if you have siblings or children.


• Monitor for symptoms like chest pain, shortness of breath, or unexplained fatigue.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases (GARD) Information Center: Bicuspid Aortic Valve


• Orphanet: Bicuspid Aortic Valve


• OMIM (Online Mendelian Inheritance in Man): Bicuspid Aortic Valve


• American Heart Association: Congenital Heart Defects