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Barcelona, Spain, 30 August 2009: The anticoagulant dabigatran is more effective than warfarin in the prevention of stroke in patients with atrial fibrillation, according to results from the RE-LY study (Randomized Evaluation of Long-term anticoagulant therapY).
“Although researchers have been looking for a replacement for warfarin for several decades, nothing has been successful as an oral blood thinner,” says Professor Stuart Connolly, Director of the Division of Cardiology at McMaster University, Canada, and one of the leading investigators of the study.
The RE-LY study compared two doses of dabigatran with the current standard therapy, warfarin, in 18,113 patients with atrial fibrillation at increased risk of stroke. The study included more than 951 centres in 44 countries. Patients were enrolled over a two-year period and then followed for one further year. The study was designed to evaluate whether either of two doses of dabigatran were non-inferior to warfarin (ie, at least as good as warfarin). The results show, however, that the higher dose of dabigatran, 150 mg twice daily, significantly reduces the risk of stroke by 34% compared to warfarin. The lower dose, 110 mg twice daily, had a similar effect to warfarin in the prevention of stroke, but with significantly less major bleeding.
According to Professor Connolly, although warfarin has been the gold standard for reducing stroke in atrial fibrillation for more than 20 years, it has many problems; these include a need for monitoring by blood test measurement, and a significant risk of increased bleeding, which makes it unsuitable for many patients. "Several new drugs have been recently studied to see if they could replace warfarin," says Professor Connolly. "None, however, has been satisfactory. Either they were not effective enough, they had too many side effects or they caused too much bleeding. This is the first time in more than 50 years that a new oral blood thinner has been developed which has been found to be both safer and more effective than existing therapy."
Atrial fibrillation is a common disorder of the heart rhythm that affects about 1% of the population and up to 10% of people over the age of 80. The major complication of atrial fibrillation is stroke. About one in six strokes are caused by atrial fibrillation. Patients with atrial fibrillation have an annual risk of stroke of 1-10%. Anticoagulants such as warfarin are the only way to prevent these strokes. -ENDS-
* The RE-LY study was co-ordinated by the Population Health Research Institute of McMaster University and sponsored by Boehringer-Ingelheim
This press release accompanies both a presentation and an ESC press conference given at the ESC Congress 2009. Written by the investigator himself/herself, this press release does not necessarily reflect the opinion of the European Society of Cardiology.