Increased risk of miscarriage or stillbirth in pregnant women with inherited thrombophilia is small

Jun 15, 2010

Research published this week in PLoS Medicine finds that pregnant women with an inherited condition that makes them more likely to form blood clots only face a small increase in the risk that they might have a miscarriage or stillbirth. The findings also show that there is no significant association between this condition, known as inherited thrombophilia, and placenta-related problems in pregnancy, suggesting that the prescription of drugs to women with thrombophilia to prevent these problems would be premature.

Marc Rodger, of the University of Ottawa in Canada, and colleagues conducted a systematic review of studies investigating placenta-related problems in pregnancy and women with thrombophilia. More than one in twenty pregnancies have complications that are linked to the placenta, These complications include pregnancy loss, pre-eclampsia (), pregnancies that result in the baby not growing properly in the womb, and problems occurring when the placenta becomes separated from the .

Previous retrospective studies suggested that there was a link between the two most common inherited thrombophilias, factor V Leiden (FVL) and prothrombin (PGM), and placenta-related pregnancy problems. These studies were conducted by analyzing databases of pregnancy records and comparing outcomes for women with and without inherited thrombophilias. By undertaking this new systematic review of prospective studies, which are conducted by recruiting patients (pregnant women with and without inherited thrombophilias) and following them over time, Rodger and colleagues were able to estimate the risk of in women with FVL or PGM.

The researchers found that the increase in the risk of pregnancy loss in women with FVL was only 1%, whilst there was no significant increase in the risk to women with PGM. The findings also show no association between inherited thrombophilia and other placenta-related pregnancy problems.. "The negative findings described in this publication are important", say the researchers, because previous studies have led some clinicians to prescribe anticoagulant drugs to with thombophilia. Further research is required, they conclude, but the prescription of anticoagulant drugs is "premature and should be considered experimental".

Explore further: Nigeria death shows Ebola can spread by air travel

More information: Rodger MA, Betancourt MT, Clark P, Lindqvist PG, Dizon-Townson D, et al. (2010) The Association of Factor V Leiden and Prothrombin Gene Mutation and Placenta-Mediated Pregnancy Complications: A Systematic Review and Meta-analysis of Prospective Cohort Studies. PLoS Med 7(6): e1000292. doi:10.1371/journal.pmed.1000292

add to favorites email to friend print save as pdf

Related Stories

Previous abortions and exercise: Do they affect pregnancy?

Nov 11, 2008

Women who have had two or more induced abortions have a reduced risk of pre-eclampsia by 60 %. It is not currently understood to what degree physical activity during pregnancy protects against pre-eclampsia, compared to previous ...

New placenta screening for high-risk pregnancies

Apr 02, 2007

For the first time ever, a team of Toronto researchers are using a combination of ultrasound and blood tests to screen high-risk pregnant mothers for placental damage. By completing these non-invasive tests, most high-risk ...

Migraines increase stroke risk during pregnancy

Mar 10, 2009

Women who suffer migraines are at an increased risk of stroke during pregnancy as well as other vascular conditions such as heart disease, high blood pressure and blood clots, concludes a study published on bmj.com today.

Recommended for you

5 things to know about Ebola outbreak in W. Africa

5 hours ago

(AP)—There has been panic and fear about the deadly Ebola disease spreading ever since Nigerian health officials reported Friday that a Liberian man sick with the disease had traveled to Togo and then Nigeria ...

Scissoring the lipids

6 hours ago

A new strategy which enables molecules to be disconnected essentially anywhere, even remote from functionality, is described by researchers from the University of Bristol in Nature Chemistry today. The method is now being ...

User comments : 0