Vitamin A and cardiac outflow tract defects

Area of Science:

• Reproductive Health
• Pediatric Cardiology
• Nutritional Science

Background:

• Cardiac outflow tract defects are a significant concern in pediatric cardiology.
• Maternal nutrition during pregnancy plays a crucial role in fetal development.
• Understanding the impact of specific nutrients like vitamin A is vital for prenatal health.

Purpose of the Study:

• To investigate the association between maternal vitamin A intake and the risk of cardiac outflow tract defects in liveborn infants.
• To differentiate the risks associated with retinol and provitamin A carotenoids from various sources.

Main Methods:

• A population-based case-control study was conducted using data from liveborn infants born between 1987 and 1989.
• Case infants (n=126) had nonsyndromic cardiac outflow tract defects; control infants (n=679) had no birth defects.
• Maternal intake of retinol and provitamin A carotenoids from food and supplements was assessed for the year preceding conception.

Main Results:

• Maternal retinol intake of 10,000 IU or more from supplements was associated with a ninefold increased risk of transposition of the great arteries (OR=9.2; 95% CI=4.0-21.2).
• This increased risk was specific to transposition of the great arteries and not observed for other outflow tract defects with normally related arteries (OR=0.8; 95% CI=0.1-6.6).
• Intakes of carotenoids and dietary retinol were not associated with an increased risk for either type of outflow tract defect.

Conclusions:

• High maternal intake of supplemental retinol during the periconceptional period may increase the risk of transposition of the great arteries.
• Dietary sources of vitamin A (retinol and carotenoids) do not appear to carry the same risk.
• This suggests a potential threshold effect or differential biological activity of supplemental versus dietary vitamin A in relation to specific congenital heart defects.