Congenital cardiovascular malformations associated with chromosome abnormalities: an epidemiologic study

Area of Science:

• Pediatric Cardiology
• Medical Genetics
• Developmental Biology

Background:

• Cardiovascular malformations are a leading cause of infant mortality.
• Understanding the etiology of congenital heart defects (CHDs) is crucial for prevention and treatment.
• The association between chromosomal abnormalities and CHDs is well-established but requires further elucidation.

Purpose of the Study:

• To identify risk factors for cardiovascular malformations in infants.
• To investigate the prevalence and specific types of cardiac defects associated with chromosomal abnormalities.
• To explore the co-occurrence of other major malformations in infants with CHDs and chromosomal abnormalities.

Main Methods:

• Population-based case-control study design.
• Ascertainment of 2102 infants with cardiovascular malformations and 2328 control subjects.
• Analysis of chromosomal abnormalities, cardiac lesion types, and other major malformations.

Main Results:

• 12.9% of infants with cardiovascular malformations had a chromosome abnormality, compared to 0.09% in controls.
• Endocardial cushion defect was the predominant cardiac abnormality in Down syndrome (60.1%).
• Alimentary and urinary tract lesions were more common in Down syndrome infants with heart disease.

Conclusions:

• A significant association exists between chromosomal abnormalities and specific cardiovascular malformations.
• Genetic factors likely influence distinct embryologic mechanisms in cardiac development.
• The findings suggest potential links to the VACTERL association and highlight the need for multidisciplinary research.