Aortic Stenosis—Child

(Stenosis, Aortic—Child; AS—Child)



Aortic stenosis (AS) is a narrowing of the aortic valve. This valve controls the flow of blood from the heart to a large artery called the aorta. The aorta carries the blood to the rest of the body.

AS can interfere or block the flow of blood from the heart to the rest of the body. It could also cause a back-up of blood into the heart and lungs. AS can range from mild to severe.

Heart Chambers and Valves

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The aortic valve is normally made up of three cusps that open and close together. In babies, AS is caused by a birth defect of the aortic valve that may result in:

  • One cusp that can not open as fully as three cusps
  • Two cusps that are damaged
  • Cusps that are partly closed or do not open correctly due to thickness

The aortic valve can also be damaged by infection or injury to the valve.

Risk Factors

Risk Factors

Factors that may increase your child’s chance of AS include:



Mild AS may not cause any symptoms. More severe AS may cause:

  • Extreme fatigue after exercise or exertion
  • Fainting with exercise or exertion
  • Pain, squeezing, pressure, or tightness of the chest, usually occurring with exertion
  • Palpitations—sensation of rapid or irregular heartbeat
  • Shortness of breath
  • Lightheadedness with exertion

In rare cases, AS can cause:

  • Abnormal heart rhythms—arrhythmia
  • Sudden death with no previous symptoms



The doctor will ask about your child’s symptoms and medical history. A physical exam will be done. The doctor may be alerted of AS by the following:

  • Abnormal chest sounds, such as a heart murmur or click
  • Noticeable chest heave or vibration when the doctor’s hand is held over your child’s heart

Tests may include:

Imaging tests evaluate the heart and surrounding structures. This can be done with:



Mild AS will be monitored for any changes or complication. Treatment may not be needed right away.

Treatment options for moderate to severe AS may include:

Lifestyle Changes

If your child has moderate to severe AS, your child may need to avoid strenuous physical activity., such as playing competitive sports.


If necessary, your child may be given medication to help prevent heart failure.


Severe AS may require surgery. Procedures include:

  • Balloon valvuloplasty—A balloon device is passed through the arteries to open or enlarge the aortic valve. Since the valve can become blocked again, surgery may need to be repeated.
  • Aortic valve replacement—Replacement of a defective heart valve.



There are no current guidelines to prevent congenital AS.


American Heart Association

National Heart, Lung, and Blood Institute


Canadian Cardiovascular Society

Canadian Society for Vascular Surgery


Aortic stenosis in children. Boston Children’s Hospital website. Available at:
Accessed June 24, 2013.

Aortic valve stenois in children. Cincinnati Children’s website. Available at:
Accessed June 24, 2013.

Aortic stenosis. EBSCO DynaMed website. Available at:
Updated May 20, 2013. Accessed June 24, 2013.

Last reviewed June 2015 by Michael Woods, MD
Last Updated: 6/3/2013

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