Bicuspid Aortic Valve (BAV)

 Illustration of bicuspid aortic valve compared to normal tricuspid aortic valve

The normal aortic valve has three leaflets that open and close to control the flow of blood into the aorta from the left ventricle of the heart as it beats. In contrast, a bicuspid aortic valve, or BAV, has only two leaflets. With this malformation, the valve doesn’t function perfectly, however, it may function adequately for years with no symptoms or obvious signs of a problem. Depending on the degree of malformation, blood flowing through the valve may make an abnormal sound, or a murmur. While some bicuspid aortic valves are silent, the detection of a murmur may be the first indication of bicuspid aortic valve disease.

Causes of Bicuspid Aortic Valve Disease

The actual cause of bicuspid aortic valve disease is not certain, but the two-leaflet valve develops in the early stages of pregnancy and the defect is present at birth. Approximately two percent of the population has bicuspid aortic valve disease, which is two times more common in males than in females. Approximately nine percent of those with BAV have a family history of the disease, making family screening advisable.

Treatment for BAV

No specific treatment is required for individuals with bicuspid aortic valve disease. However, a patient diagnosed with the disease should be monitored on a regular basis in case of complications, including:

  • Aortic stenosis: The aortic valve does not open wide enough, causing restricted blood flow
  • Aortic regurgitation/insufficiency: The aortic valve does not close completely, causing the valve to leak
  • Infective endocarditis: Bacteria or other organisms create an infection of heart valves and the heart lining
  • Aortic aneurysm: The vessel wall of the aorta balloons outward
  • Coarctation of the aorta: The aorta becomes too narrow, affecting blood flow

Volunteer for the Bicuspid Aortic Valve Registry

The University of Michigan has established a Bicuspid Aortic Valve registry study. The purpose of the study is to gather information on patients with bicuspid aortic valves, to better understand bicuspid aortic valves, and to identify the long term effects of this congenital disease. To find out more, visit the Bicuspid Aortic Valve registry page on

Make an Appointment

To schedule an appointment to discuss bicuspid aortic valve disease or any other cardiovascular condition, call us at 888-287-1082 or visit our Make a Cardiovascular Appointment page, where you may fill out a Patient Appointment Request Form and view other details about making an appointment.