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

June 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".

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

Related Stories

Recommended for you

Zika in fetal brain tissue responds to a popular antibiotic

November 30, 2016

Working in the lab, UC San Francisco researchers have identified fetal brain tissue cells that are targeted by the Zika virus and determined that azithromycin, a common antibiotic regarded as safe for use during pregnancy, ...

Zika and glaucoma linked for first time in new study

November 30, 2016

A team of researchers in Brazil and at the Yale School of Public Health has published the first report demonstrating that the Zika virus can cause glaucoma in infants who were exposed to the virus during gestation.

Flu forecasts successful on neighborhood level

November 30, 2016

Scientists at Columbia University's Mailman School of Public Health developed a computer model to predict the onset, duration, and magnitude of influenza outbreaks for New York City boroughs and neighborhoods. They found ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.