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Atrial Septal Defect
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Atrial Septal Defect
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A septal defect is a hole in the septum, the muscle wall separating the right chambers of the heart from the left chambers of the heart. A septal defect is sometimes called "a hole in the heart."

Illustration showing atrial septal defect.If a baby is born with a hole in the septum, blood leaks back from the left side of the heart into the right. If the leaking is minor, there may be only minor problems. But if there is a lot of leaking, the heart will try to make up for this by getting larger. Children who have a septal defect usually have trouble breathing and do not grow normally.

What is an atrial septal defect?

Atrial septal defect (ASD) means that the hole is located between the upper chambers of the heart (the right and left atria). Since the pressure is higher on the left side of the heart, blood gets pushed through the hole from left to right. This may cause the right atrium to become enlarged.

Before birth, the fetal heart normally has a hole (called the foramen ovale) between the left and right atria. Usually, this hole closes soon after birth. If it does not close completely, the problem is called an ostium secundum defect. Ostium secundum defect is the most common kind of ASD. Other kinds include ostium primum defect and sinus venosum defect. Each type of ASD is associated with a hole in a different part of the atrial septum.

What are the symptoms and signs?

Symptoms and signs of ASD include

  • Shortness of breath or trouble breathing
  • Palpitations (feeling your heart beat strongly)
  • Failure to grow normally

Even though ASD is present from birth, symptoms often do not appear during childhood. Instead, the right atrium may become larger over time, causing problems in adulthood. Adults with ASD may experience arrhythmia or heart failure. Heart failure means that the heart cannot pump enough blood to meet the body's needs. It causes blood and fluid to build up in certain parts of the body, such as the lungs, liver, abdomen, and legs.

How is it treated?

About 40% of atrial septal defects will close by themselves before the child is 2 years old. After that time, natural closure is rare, so surgery is usually recommended in serious cases (when the right side of the heart is enlarged).

Surgery usually involves covering the hole with a patch. To close the hole without open-heart surgery, some doctors may use a catheterization procedure. In this procedure, a long, thin tube called a catheter is inserted into the body, usually in the groin area. From there, it is guided through an artery up to the heart. Once the catheter is in the heart, tiny devices called occlusion devices are used to close up the hole. The catheter is then removed, leaving the occlusion device to block the hole.

Surgery to close an atrial septal defect is successful in 99% of cases. If the surgery is done in childhood, the enlarged heart will return to its normal size in 4 to 6 months.

See also on this site: Congenital Heart Disease

See on other sites:

MedlinePlus
www.nlm.nih.gov/medlineplus/ency/article/000157.htm
Atrial septal defect

Texas Adult Congenital Heart Center (TACH) program 
https://www.bcm.edu/healthcare/care-centers/congenital-heart enables patients with congenital heart disease to receive a seamless continuation of care from birth to old age.


Updated December 2013
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Texas Heart Institute Heart Information Center
Through this community outreach program, staff members of the Texas Heart Institute (THI) provide educational information related to the prevention, diagnosis, and treatment of cardiovascular disease. It is not the intention of THI to provide specific medical advice, but rather to provide users with information to better understand their health and their diagnosed disorders. Specific medical advice will not be provided and THI urges you to visit a qualified physician for diagnosis and for answers to your questions.
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