Pre-eclampsia rates on the rise in the US

(Press-News.org) Contact information: Stephanie Berger
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Columbia University's Mailman School of Public Health
Pre-eclampsia rates on the rise in the US Study shows a relative increase of 322 percent for severe pre-eclampsia November 20, 2013 -- A latest study by researchers at the Mailman School of Public Health and Columbia University Medical Center reports that pre-eclampsia, characterized by an elevation in the blood pressure and excess protein in the urine of pregnant women, has a 1.5-fold to 2-fold higher incidence in first pregnancies. The condition, which causes complications in approximately 3-6% of all pregnancies, is also associated with high risks of preterm delivery, intrauterine growth restriction, placental abruption, and perinatal mortality. Findings are published online in the British Medical Journal.

The study by Drs. Cande Ananth, Katherine Keyes, and Ronald Wapner in the Departments of Epidemiology and Obstetrics and Gynecology, examined data on 120 million births in the United States between 1980 and 2010 from national hospital discharge surveys. This is the largest cohort study to analyze changes in rates of pre-eclampsia in the U.S.

According to findings, pre-eclampsia rates rose from 3.4% in 1980 to 3.8% in 2010. This increase was due to the rise in rates of severe pre-eclampsia -- from 0.3% in 1980 to 1.4% in 2010, a relative increase of 322%. At the same time, rates of mild pre-eclampsia declined, from 3.1% in 1980 to 2.5% in 2010. Women born in the mid-1970s were at increased risk for mild pre-eclampsia, whereas women born in the more recent periods showed an increased risk of severe pre-eclampsia, suggesting a birth cohort effect. The researchers note that the increasing obesity and decreasing smoking rates in the United States across the last three decades explain, at least in part, the trends in the observed pre-eclampia rates.

Why the study is newsworthy: The researchers analyzed data collected across 30 years to understand the association of maternal age with time of disease occurrence and mother's date of birth on rates of pre-eclampsia. Results suggest that reducing obesity rates could also be favorable to a reduction in pre-eclampsia rates.

### About Columbia University's Mailman School of Public Health Founded in 1922, Columbia University's Mailman School of Public Health pursues an agenda of research, education, and service to address the critical and complex public health issues affecting New Yorkers, the nation and the world. The Mailman School is the third largest recipient of NIH grants among schools of public health. Its over 450 multi-disciplinary faculty members work in more than 100 countries around the world, addressing such issues as preventing infectious and chronic diseases, environmental health, maternal and child health, health policy, climate change & health, and public health preparedness. It is a leader in public health education with over 1,300 graduate students from more than 40 nations pursuing a variety of master's and doctoral degree programs. The Mailman School is also home to numerous world-renowned research centers including the International Center for AIDS Care and Treatment Programs (ICAP), and the Center for Infection and Immunity. For more information, please visit http://www.mailman.columbia.edu