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Health & Pregnancy

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Diabetes, High Blood Pressure During Pregnancy Increase Middle-Age Heart Risk

Study: Pregnancy-Related Diabetes or High Blood Pressure May Be Effective Early-Warning Signs for Heart Disease
By Cari Nierenberg
WebMD Health News
Reviewed by Laura J. Martin, MD

Feb. 21, 2012 -- When a woman has high blood pressure or high blood sugar levels during pregnancy, this may help predict her chances of developing heart disease perhaps as early as middle age, a new study suggests.

British researchers were hoping to understand why women who have certain common pregnancy-related complications tend to be at higher risk for heart disease later in life.

To learn more about these effects, they analyzed data from more than 3,400 pregnant women who participated in a long-term health study of British parents and children.

Scientists gathered information from the women's medical records during pregnancy about their blood pressure, glucose levels in blood and urine, as well as maternal weight gain.

They also collected data from birth records about their babies' birth weight, whether the women smoked during pregnancy, and their age at delivery.

About 18 years after giving birth, the mothers now at an average age of 48 had a follow-up visit at a health clinic. At that time, the women's height, weight, waist size, blood pressure, and blood glucose were all measured. They also tested lipid (blood fat) and insulin levels, which can both influence heart disease risk.

The research appears in Circulation: Journal of the American Heart Association.

Heart Health Clues

Researchers found that women who gave birth to babies who were significantly larger than average tended to have larger waists and higher glucose concentrations in their blood. Mothers who had babies who were significantly smaller than average had higher blood pressure.

Scientists also calculated each woman's risk of heart disease in the next 10 years.

They found that pregnancy-related high blood pressure (preeclampsia) was linked with a 31% greater risk of having heart disease in middle age. It might be a better predictor of future heart problems than any other pregnancy-related complication.

Women with pregnancy-related diabetes had a 26% greater chance of heart disease during midlife. Having diabetes during pregnancy also increases a woman's odds of having diabetes past middle age.

"Pregnancy may provide an opportunity to identify women at increased risk of heart disease while they are relatively young," researcher Abigail Fraser, PhD, says in a news release. She is a research fellow at the School of Community and Social Medicine at the University of Bristol in England.

Knowing earlier in life if a woman has a greater likelihood of heart disease may give health professionals more time to discuss with her heart-healthy lifestyle changes or other treatments needed to reduce this risk.

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