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Welcome alternative to warfarin for people at high risk of stroke

Results of an international study in this week's issue of THE LANCET provide strong evidence that the oral direct thrombin-inhibitor ximelagatran could be a safe and effective alternative to warfarin in reducing stroke among people with atrial fibrillation.

Atrial fibrillation (irregular and rapidly beating atria) increases the risk of cardiac blood clots, which can cause ischaemic stroke. Warfarin has been used for decades for people at high risk of stroke because of its blood-thinning capability; however there are many drawbacks of warfarin treatment: an increased risk of bleeding, and possible interaction with food and other medication necessitating at least monthly blood testing and frequent dose adjustment. The oral direct thrombin-inhibitor ximelagatran could be a more reliable alternative to warfarin for people at high stroke risk.

In an international study (SPORTIF III: Stroke Prevention using an ORal Thrombin Inhibitor in atrial Fibrillation), 3407 patients from Europe, Asia, and Australia with atrial fibrillation and one or more stroke risk factors were randomly allocated warfarin or oral ximelagatran. Average follow-up took place after 17 months.

Oral ximelagatran was at least as effective in reducing the frequency of stroke or systemic blood clots (the primary outcomes) as warfarin (relative risk reduction 30%, absolute risk reduction 0.7% for ximelagatran; however this was not statistically significant). Rates of disabling or fatal stroke, death, and major bleeding were similar between both groups.

Lead investigator S Bertil Olsson from University Hospital Lund, Sweden, comments: "We have shown that ximelagatran, administered in a fixed dose without coagulation monitoring, protects high-risk patients with atrial fibrillation against thromboembolism at least as effectively as well-controlled warfarin, and is associated with less bleeding. The preliminary reported SPORTIF V trial presented at the November 2003 American H
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Contact: Joe Santangelo
j.santangelo@elsevier.com
212-633-3810
Lancet
20-Nov-2003


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