Tricuspid Atresia—Child

(Single Ventricle Defect—Child)


Tricuspid atresia is an abnormal development of the right side of the heart. It includes a missing valve between the upper and lower chamber. Tricuspid atresia makes it difficult for your heart to efficiently pump blood to the lungs to get oxygen. Holes will be present in the walls between the left and right side of the heart that cause oxygen-rich and oxygen-poor blood to mix. These holes are necessary to allow blood to be brought to the lungs before a repair can be done. It is often associated with a smaller than normal right lower chamber and abnormalities of the pulmonary artery and aorta.
Heart Chambers and Valves
heart anatomy
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Blood Flow Through the Heart
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Tricuspid atresia develops when the baby is in the womb. It is not known exactly why some hearts develop this way.

Risk Factors

Factors that increase the risk for congenital heart defects like tricuspid atresia include:
  • Family history of congenital heart defect
  • Chromosomal disorder such as Down syndrome
  • Previous pregnancy with fetal heart abnormalities or miscarriage
  • Conditions during pregnancy, such as:
    • Being infected with a virus
    • Having poorly controlled diabetes
    • Drinking alcohol
    • Taking certain medications

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