Related Experiment Videos
Risk factors for conotruncal cardiac defects in Atlanta
M M Adams1, J Mulinare, K Dooley
1Birth Defects and Genetic Diseases Branch, Centers for Disease Control, Atlanta, Georgia 30333.
Insights
Maternal diabetes, significant stress, and a family history of heart defects increase the risk of conotruncal cardiac defects in infants. This study identified key maternal risk factors for these congenital heart conditions.
Area of Science:
- Cardiology
- Epidemiology
- Public Health
Background:
- Conotruncal cardiac defects (CTDs) are serious congenital heart conditions with largely unknown causes.
- Understanding maternal risk factors is crucial for preventing CTDs.
Purpose of the Study:
- To investigate potential maternal risk factors associated with conotruncal cardiac defects.
- To identify specific exposures or conditions increasing infant risk.
Main Methods:
- A case-control study design was employed in metropolitan Atlanta.
- Infants diagnosed with truncus arteriosus, transposition of the great arteries, or tetralogy of Fallot were cases.
- Control infants were selected from those without birth defects, with maternal interviews conducted for both groups.
Main Results:
- Maternal diabetes showed a significantly increased risk (odds ratio 5.6).
- Maternal stress, particularly from job loss or bereavement, was associated with higher risk (odds ratio 2.4).
- A family history of cardiac defects in a sibling also elevated risk (odds ratio 4.8).
Conclusions:
- Maternal diabetes, significant life stress, and a sibling's cardiac history are identified risk factors for CTDs.
- The study ruled out many other common exposures as major risk factors.
- No clear explanation was found for the rising rates of certain CTDs in the study population.
Abstract:
Because the causes of conotruncal cardiac defects are poorly understood, a case-control study was conducted to investigate maternal risk factors for conotruncal cardiac defects. Eligible cases included all infants who were born from 1976 through 1980 to residents of the five county metropolitan Atlanta area and diagnosed with truncus arteriosus, transposition of the great arteries or tetralogy of Fallot. Eligible control infants were a sample of comparable infants without birth defects. Maternal interviews were conducted for 73% (83 of 114) of eligible cases and 72% (1,303 of 1,804) of eligible control infants. The results showed increased risks associated with maternal diabetes (odds ratio 5.6; 90% confidence interval 2.5 to 15.6), maternal stress related to job loss, divorce, separation or death of a close friend or relative (odds ratio 2.4; 90% confidence interval 1.4 to 4.2) and a history of a sibling with a cardiac defect (odds ratio 4.8; 90% confidence interval 2.2 to 10.5). The statistical power of the data was adequate to rule out threefold or greater increases in risk for a wide variety of other exposures, including maternal illnesses other than diabetes, contraceptive use, nonmedicinal drugs (for example, coffee, tea, alcohol, cigarettes, street drugs), employment and education. This population-based study offers no clues that could explain either the high rate of transposition of the great arteries or the temporal trend of an increasing rate of tetralogy of Fallot in Atlanta.