Is Congenital Heart Disease Inherited?

 

Congenital heart disease can be influenced by genetics, but it is not always inherited in a direct or predictable way.

Most cases occur without a known family history. However, when a close relative has CHD, the likelihood of a child being born with a heart defect does increase.

In the general population, the risk is around 1%. If a parent is affected, this typically rises to between 3% and 5%, although this can vary depending on the specific condition.

There are several genetic pathways involved.

Some heart defects are linked to chromosomal conditions such as Down’s syndrome or 22q11.2 deletion. Others may involve single gene mutations that can be passed between generations.

In many cases, the cause is multifactorial. This means a combination of genetic predisposition and environmental factors contributes to development.

Understanding this helps clarify an important point.

Genetics influences risk, but it does not determine outcome.

Genetic counselling and prenatal screening can provide further insight for families planning a pregnancy.

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