Higher Bleeding Risk for Obese Patients on Warfarin

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Higher Bleeding Risk for Obese Patients on Warfarin
Higher Bleeding Risk for Obese Patients on Warfarin

(HealthDay News) -- Obese patients taking warfarin have a higher risk of experiencing a bleeding event compared to their normal-weight counterparts, a new study suggests. The findings were presented at the American Heart Association's Arteriosclerosis, Thrombosis and Vascular Biology/Peripheral Vascular Disease 2015 Scientific Sessions, held from May 7 to 9 in San Francisco.

Adedotun Ogunsua, M.D., and colleagues from the University of Massachusetts Medical School in Worcester followed 863 people taking warfarin for a year. The average age of those in the study was 69.5 years. Of all the study participants, 21 percent were considered at normal weight. Thirty-eight percent were classified as overweight and 41 percent were considered obese.

The researchers found that 71 people -- 8.2 percent -- experienced a bleeding event. About one-third of these episodes were major (gastrointestinal, intracerebral, and retroperitoneal hemorrhage), and two-thirds were minor (epistaxis, hematuria, vaginal, and skin bleeds). When they looked at the data based on weight, the researchers found that people who were obese had an 84 percent higher risk of a major bleeding event. And, the heavier someone was, the greater their risk of bleeding while taking warfarin.

"Bleeding risk is higher in obese compared to normal-weight individuals who are on warfarin. Risk is higher with increasing body mass index," the authors write. "Future studies are needed to understand the mechanism by which obesity increases bleeding risk for patients on warfarin and whether similar risk [exists] for the novel oral anticoagulants."

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