[ Back to EurekAlert! ] Public release date: 29-May-2013
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Contact: Jenni Glenn Gingery
jgingery@endo-society.org
301-941-0240
The Endocrine Society

Thyroid conditions raise risk of pregnancy complications

Hormone disorders linked to higher rates of preterm birth, preeclampsia

Chevy Chase, MD—Pregnant women who have thyroid disorders face greater risk of preterm birth and other complications that have short- and long-term consequences for the health of mother and child, according to a recent study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM).

The risk of complications is heightened for both women who have underactive thyroid glands – a condition known as hypothyroidism – and those with overactive thyroid glands, or hyperthyroidism. Up to four percent of all pregnancies involve mothers with thyroid conditions.

"In the United States, at least 80,000 pregnant women each year have thyroid diseases," said the study's lead author, Tuija Männistö, MD, PhD, of the National Institutes of Health's Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD). "These women are at increased risk of having serious adverse pregnancy outcomes, including hypertension and preterm birth. They also have a higher rate of labor inductions and other birth interventions."

The retrospective cohort study analyzed electronic medical records and 223,512 pregnancies where a single child was born to determine the rate of complications among women with thyroid conditions. The data was taken from the Consortium on Safe Labor study performed from 2002-2008. The study found women who had thyroid conditions were more likely to develop preeclampsia and tended to be admitted to the intensive care unit more frequently. Women with hypothyroidism, the most common thyroid disease in pregnancy, also were more likely to develop gestational diabetes and had a higher rate of cesarean delivery.

"Women need appropriate thyroid hormone levels to support a healthy pregnancy, so it is very important to carefully monitor expecting mothers who have thyroid diseases," said one of the study's authors, Pauline Mendola, PhD, of the NIH's NICHD. "We also need more research to identify ways to reduce the risks these women currently face."

The Endocrine Society's clinical practice guidelines for managing thyroid dysfunction during pregnancy and postpartum are available online at http://www.endo-society.org/guidelines/upload/Thyroid-Exec-Summ.pdf.

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Other researchers working on the study include: J. Grewal, Y. Xie, Z. Chen, and S.K. Laughon of the NIH's NICHD.

The article, "Thyroid Diseases and Adverse Pregnancy Outcomes in a Contemporary U.S. Cohort," was published online on May 29.

Founded in 1916, The Endocrine Society is the world's oldest, largest and most active organization devoted to research on hormones and the clinical practice of endocrinology. Today, The Endocrine Society's membership consists of over 16,000 scientists, physicians, educators, nurses and students in more than 100 countries. Society members represent all basic, applied and clinical interests in endocrinology. The Endocrine Society is based in Chevy Chase, Maryland. To learn more about the Society and the field of endocrinology, visit our site at http://www.endo-society.org. Follow us on Twitter at https://twitter.com/#!/EndoMedia.



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