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Birth Defects Res A Clin Mol Teratol. 2015 Oct;103(10):823-33. doi: 10.1002/bdra.23351. Epub 2015 Jun 2.

Maternal occupational pesticide exposure and risk of congenital heart defects in the National Birth Defects Prevention Study.

Author information

1
Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, Ohio.
2
Department of Epidemiology, College of Public Health, The University of Iowa, Iowa City, Iowa.
3
Department of Epidemiology, University of Kentucky, Lexington, Kentucky.
4
University of Arkansas for Medical Sciences, Little Rock, Arkansas.
5
Department of Pediatrics, Section of Hematology and Oncology, Baylor College of Medicine, Houston, Texas.
6
Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
7
Department of Epidemiology and Biostatistics, School of Public Health, State University of New York at Albany, Rensselaer, New York.
8
Center for Environmental Health, New York State Department of Health, Albany, New York.
9
Departments of Medicine and Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi.
10
Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities, Atlanta, Georgia.

Abstract

BACKGROUND:

Congenital heart defects (CHDs) are common birth defects, affecting approximately 1% of live births. Pesticide exposure has been suggested as an etiologic factor for CHDs, but previous results were inconsistent.

METHODS:

We examined maternal occupational exposure to fungicides, insecticides, and herbicides for 3328 infants with CHDs and 2988 unaffected control infants of employed mothers using data for 1997 through 2002 births from the National Birth Defects Prevention Study, a population-based multisite case-control study. Potential pesticide exposure from 1 month before conception through the first trimester of pregnancy was assigned by an expert-guided task-exposure matrix and job history details self-reported by mothers. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using multivariable logistic regression.

RESULTS:

Maternal occupational exposure to pesticides was not associated with CHDs overall. In examining specific CHD subtypes compared with controls, some novel associations were observed with higher estimated pesticide exposure: insecticides only and secundum atrial septal defect (OR = 1.8; 95% CI, 1.3-2.7, 40 exposed cases); both insecticides and herbicides and hypoplastic left heart syndrome (OR = 5.1; 95% CI, 1.7-15.3, 4 exposed cases), as well as pulmonary valve stenosis (OR = 3.6; 95% CI, 1.3-10.1, 5 exposed cases); and insecticides, herbicides, and fungicides and tetralogy of Fallot (TOF) (OR = 2.2; 95% CI, 1.2-4.0, 13 exposed cases).

CONCLUSION:

Broad pesticide exposure categories were not associated with CHDs overall, but examining specific CHD subtypes revealed some increased odds ratios. These results highlight the importance of examining specific CHDs separately. Because of multiple comparisons, additional work is needed to verify these associations.

KEYWORDS:

birth defects; congenital heart defects; occupation; pesticides

PMID:
26033688
PMCID:
PMC4607631
DOI:
10.1002/bdra.23351
[Indexed for MEDLINE]
Free PMC Article

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