Shao Lin1, Ziqiang Lin2, Yanqiu Ou3, Aida Soim4, Srishti Shrestha5, Yi Lu6, Scott Sheridan7, Thomas J Luben8, Edward Fitzgerald9, Erin Bell9, Gary M Shaw10, Jennita Reefhuis11, Peter H Langlois12, Paul Romitti13, Marcia L Feldkamp14, Sadia Malik15, Cristian Pantea16, Seema Nayak16, Syni-An Hwang4, Marilyn Browne4. 1. Department of Environmental Health Sciences, University at Albany, Rensselaer, NY, United States; Department of Epidemiology and Biostatistics, University at Albany, Rensselaer, NY, United States. Electronic address: slin@albany.edu. 2. Department of Mathematics, University at Albany, Albany, NY, United States. 3. Department of Epidemiology, Guangdong Cardiovascular Institute, Guangdong Provincial Key Laboratory of South China Structural Heart Disease, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China. 4. Department of Epidemiology and Biostatistics, University at Albany, Rensselaer, NY, United States; New York State Department of Health, Albany, NY, United States. 5. Department of Epidemiology and Biostatistics, University at Albany, Rensselaer, NY, United States. 6. Department of Environmental Health Sciences, University at Albany, Rensselaer, NY, United States. 7. Department of Geography, Kent State University, Kent, OH, United States. 8. Office of Research and Development, U.S. Environmental Protection Agency, RTP, NC, United States. 9. Department of Environmental Health Sciences, University at Albany, Rensselaer, NY, United States; Department of Epidemiology and Biostatistics, University at Albany, Rensselaer, NY, United States. 10. Stanford School of Medicine, Stanford, CA, United States. 11. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, United States. 12. Texas Department of State Health Services, Austin, TX, United States. 13. Department of Epidemiology, The University of Iowa, Iowa City, IA, United States. 14. University of Utah School of Medicine, Salt Lake City, UT, United States. 15. University of Arkansas for Medical Sciences, Little Rock, AR, United States. 16. New York State Department of Health, Albany, NY, United States.
Abstract
BACKGROUND/ OBJECTIVE: Few studies have assessed the effect of ambient heat during the fetal development period on congenital heart defects (CHDs), especially in transitional seasons. We examined and compared the associations between extreme heat and CHD phenotypes in summer and spring, assessed their geographical differences, and compared different heat indicators. METHODS: We identified 5848 CHD cases and 5742 controls (without major structural defects) from the National Birth Defects Prevention Study, a US multicenter, population-based case-control study. Extreme heat events (EHEs) were defined by using the 95th (EHE95) or 90th (EHE90) percentile of daily maximum temperature and its frequency and duration during postconceptional weeks 3-8. We used a two-stage Bayesian hierarchical model to examine both regional and study-wide associations. Exposure odds ratios (ORs) were calculated using multivariate logistic regression analyses, while controlling for potential confounding factors. RESULTS: Overall, we observed no significant relationships between maternal EHE exposure and CHDs in most regions during summer. However, we found that 3-11 days of EHE90 during summer and spring was significantly associated with ventricular septal defects (VSDs) study-wide (ORs ranged: 2.17-3.24). EHE95 in spring was significantly associated with conotruncal defects and VSDs in the South (ORs: 1.23-1.78). Most EHE indicators in spring were significantly associated with increased septal defects (both VSDs and atrial septal defects (ASDs)) in the Northeast. CONCLUSION: While generally null results were found, long duration of unseasonable heat was associated with the increased risks for VSDs and ASDs, mainly in South and Northeast of the US. Further research to confirm our findings is needed.
BACKGROUND/ OBJECTIVE: Few studies have assessed the effect of ambient heat during the fetal development period on congenital heart defects (CHDs), especially in transitional seasons. We examined and compared the associations between extreme heat and CHD phenotypes in summer and spring, assessed their geographical differences, and compared different heat indicators. METHODS: We identified 5848 CHD cases and 5742 controls (without major structural defects) from the National Birth Defects Prevention Study, a US multicenter, population-based case-control study. Extreme heat events (EHEs) were defined by using the 95th (EHE95) or 90th (EHE90) percentile of daily maximum temperature and its frequency and duration during postconceptional weeks 3-8. We used a two-stage Bayesian hierarchical model to examine both regional and study-wide associations. Exposure odds ratios (ORs) were calculated using multivariate logistic regression analyses, while controlling for potential confounding factors. RESULTS: Overall, we observed no significant relationships between maternal EHE exposure and CHDs in most regions during summer. However, we found that 3-11 days of EHE90 during summer and spring was significantly associated with ventricular septal defects (VSDs) study-wide (ORs ranged: 2.17-3.24). EHE95 in spring was significantly associated with conotruncal defects and VSDs in the South (ORs: 1.23-1.78). Most EHE indicators in spring were significantly associated with increased septal defects (both VSDs and atrial septal defects (ASDs)) in the Northeast. CONCLUSION: While generally null results were found, long duration of unseasonable heat was associated with the increased risks for VSDs and ASDs, mainly in South and Northeast of the US. Further research to confirm our findings is needed.
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