Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Health & Pregnancy

Font Size

High Blood Pressure in Pregnancy May Have Hormonal Culprit

WebMD Health News

Oct. 27, 2000 (Washington) -- The cause of the dangerous rise in the blood pressure of pregnant women has long been a medical mystery. But researchers from Wake Forest University School of Medicine in Winston-Salem, North Carolina and another team from Santiago, Chile, have found what appears to be an important clue to the cause of the condition called preeclampsia.

It is not clear what brings on the episodes of high blood pressure, but preeclampsia tends to run in families and may have a genetic cause, say researchers.

About 6% of pregnant women in the U.S. develop preeclampsia. While the disease can be serious and sometimes fatal, it more commonly forces women to be admitted to the hospital for bedrest and monitoring. This helps their doctors determine the best time to deliver the baby, which is the only known cure for the disease.

Two different studies suggest that the hormone angiotensin-(1-7) may be critical in controlling this blood pressure, swelling, and protein in the urine that can develop during the last weeks of pregnancy. Normally, angiotensin-(1-7) operates as a dilator to keep blood vessels open. However, in women with preeclampsia, the hormone level goes down rather than up, as it does in women with normal pregnancies. That can result in narrowing of the blood vessels and a rise in blood pressure.

The Wake Forest study included 15 women with preeclampsia, 15 normal pregnant women, and 15 nonpregnant women. Studying blood samples, the researchers looked at several substances involved in regulating blood pressure including angiotensin-(1-7). Typically, all of them would be expected to increase during pregnancy. However, the patients with preeclampsia all had lower levels than the normal women.

Apparently this is the first time that angiotensin-(1-7) levels have been measured in pregnant women, according to the lead researcher K. Bridget Brosnihan, PhD, a professor at Wake Forest. She tells WebMD the finding may lead to new screening tests as well as treatment.

While this is a small study, Brosnihan says she is hoping to hear soon from the NIH about a possible larger project. The idea would be to get a relatively large group of pregnant women and follow them throughout pregnancy, as opposed to measuring "one point in time."

Pregnancy Week-By-Week Newsletter

Delivered right to your inbox, get pictures and facts on
what to expect each week of your pregnancy.

Today on WebMD

hand circling date on calendar
Track your most fertile days.
woman looking at ultrasound
Week-by-week pregnancy guide.
Pretty pregnant woman timing contaction pains
The signs to watch out for.
pregnant woman in hospital
Are there ways to do it naturally?
slideshow fetal development
pregnancy first trimester warning signs
What Causes Bipolar
Woman trying on dress in store
pregnant woman
Woman looking at pregnancy test
calendar and baby buggy
dark chocolate squares