In most cases, the exact cause of a congenital heart defect, such as tricuspid atresia, is unknown, but several factors may increase the risk of a baby being born with this condition:

  • A mother who had German measles (rubella) or another viral illness during early pregnancy
  • A parent who has a congenital heart defect
  • Drinking alcohol during pregnancy
  • A mother who has poorly controlled diabetes
  • Use of some types of medications during pregnancy, such as the acne drug isotretinoin (Claravis, Sotret) and some anti-seizure medications
  • The presence of Down syndrome, a genetic condition that results from an extra 21st chromosome
Nov. 08, 2012