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Pre-pregnancy Obesity as a Modifier of Gestational Diabetes and Birth Defects Associations: A Systematic Review

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Abstract

Objective Inconsistent findings of associations between gestational diabetes mellitus (GDM) and birth defects suggest unaccounted confounders may underlie the actual basis for such associations. We conducted a systematic review to assess observed associations between GDM and birth defects and the extent to which these could be explained by pre-pregnancy obesity. Methods Using a combination of search terms for GDM and birth defects, we searched PubMed, Scopus, CINAHL, and ClinicalTrials.gov for human-based studies published through September 2013. Studies were eligible for inclusion if they included information on maternal diabetes status, method of diagnosis of GDM, and assessment of birth defects. Twenty-four of 768 potential articles were included. We collected information on study design, location and period, method of determination of diabetes status, types of birth defects, and measures of association reported. Results There was no evidence for consistent association of GDM with birth defects, with the exception of a weak association between GDM and congenital heart defects. When stratified by maternal pre-pregnancy BMI, an association between GDM and congenital heart defects and between GDM and neural tube defects was evident only in women with both GDM and pre-pregnancy obesity. Conclusions for Practice Our findings suggest reported associations between GDM and birth defects may be due, in part, to undiagnosed metabolic disorders associated with obesity, such as pregestational diabetes mellitus, rather than GDM. These findings highlight the need for increased efforts for pre-pregnancy screening for undiagnosed diabetes and awareness of the importance of weight management among women of childbearing age with obesity.

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Authors and Affiliations

  1. Department of Pediatrics, University of Mississippi School of Medicine, 2500 North State Street, Jackson, MS, 39216, USA

    Aimee S. Parnell & Adolfo Correa

  2. Children’s of Mississippi, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA

    Aimee S. Parnell

  3. Department of Medicine, University of Mississippi School of Medicine, 2500 North State Street, Jackson, MS, 39216, USA

    Adolfo Correa

  4. University of Maryland School of Medicine, 655 W. Baltimore Street, Room 14-029, Baltimore, MD, 21201-1559, USA

    E. Albert Reece

Authors
  1. Aimee S. Parnell
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  2. Adolfo Correa
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  3. E. Albert Reece
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Correspondence to Aimee S. Parnell.

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Parnell, A.S., Correa, A. & Reece, E.A. Pre-pregnancy Obesity as a Modifier of Gestational Diabetes and Birth Defects Associations: A Systematic Review. Matern Child Health J 21, 1105–1120 (2017). https://doi.org/10.1007/s10995-016-2209-4

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