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Causes and Risk Factors

In most cases (as many as 90%), the cause for the congenital heart defect is unknown. Of the approximately 10–15% of cases in which the cause can be determined, one of the following circumstances may be the cause for the condition.

Chromosomal Abnormalities and Genetic Disorders
About 5–8% of all congenital heart defects occur in babies born with Down syndrome or other chromosomal abnormalities, such as Turner syndrome, trisomy 18, trisomy 13, DiGeorge ...Read the full article