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Member Research and Reports

Member Research and Reports

Pittsburgh Finds Dabigatran Superior to Warfarin When Anticoagulation is Resumed after Bleeding

In the first analysis of how to treat patients on anticoagulants who suffer a major bleeding event, a clinical practice that routinely gives doctors pause, while also evaluating a new drug, University of Pittsburgh Graduate School of Public Health researchers aim to provide much-needed guidance to clinicians trying to balance the risks of stroke versus bleeding when determining the best treatment.

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The analysis, published in the journal Stroke, determined that resuming anticoagulation therapy after a person suffers a major bleeding event was associated with a higher likelihood of stroke-free survival than discontinuing anticoagulation. Furthermore, restarting therapy with the new oral anticoagulant dabigatran was associated with a lower risk of recurrent hemorrhage in these cases than the old standby drug warfarin.

People take anticoagulants to avoid blood clots when they have a risk for stroke or heart attack, but the downside is that these medications increase a person’s risk of severe bleeding — such as in the brain or gut — because the blood isn’t clotting as well as it otherwise might.

“If a patient who is on an anticoagulant to avoid a stroke has a major bleeding event, doctors are faced with a catch-22: Discontinue the anticoagulant to avoid future bleeding, but again place their patient at increased risk of stroke; or resume the anticoagulant to continue avoiding a stroke, but then have to worry about another bleeding event,” said lead author Dr. Inmaculada Hernandez, an assistant professor in Pitt’s School of Pharmacy, who completed this work as a doctoral student at Pitt Public Health.

“It causes a lot of uncertainty for physicians, especially because patients at highest risk of recurrent bleeding also are at highest risk of stroke,” said co-author Dr. Yuting Zhang, associate professor of health policy and management at Pitt Public Health, and Hernandez’s doctoral dissertation committee chair.

The Pitt research team obtained data from 2010 to 2012 for a random sample of Medicare beneficiaries. They then followed nearly 90,000 people who had filled prescriptions for the anticoagulants warfarin, which has been used as a medication since 1954, and dabigatran, which was approved by the U.S. Food and Drug Administration in 2010. More than 1,500 of those people suffered a major bleeding event while using one of the drugs. About half of those people resumed one of the two anticoagulants a few months after the bleeding, while the others did not.

The risk of dying from any cause or having a stroke was 23 to 34 percent higher in patients who discontinued anticoagulation therapy compared to those who resumed it. People who took dabigatran after their initial bleeding event had nearly half the risk of another major bleeding event within one year compared with those who took warfarin.

More information can be found at http://www.upmc.com/media/NewsReleases/2016/Pages/zhang_bleedingdrug_Stroke.aspx