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Congenital heart diseases are structural or functional abnormalities of the heart and great vessels that are present from birth. They arise due to defects in embryonic development of the cardiovascular system, often during the first eight weeks of gestation. Genetic mutations, chromosomal abnormalities such as Down syndrome, and environmental influences including maternal infections, diabetes, or drug exposure contribute to their occurrence. __________ ___ __________ ________ _____ ________ _______ _____ ______ _______.
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