European Heart Journal Advance Access originally published online on June 14, 2006
European Heart Journal 2006 27(16):1947-1953; doi:10.1093/eurheartj/ehl103
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Anticoagulation in women with non-valvular atrial fibrillation in the stroke prevention using an oral thrombin inhibitor (SPORTIF) trials
1 Department of Medicine, Section of Cardiology, University of Chicago Hospitals, University of Chicago, 5841 S Maryland Avenue, MC2016, Chicago, IL 60637, USA
2 Emory University School of Medicine, Atlanta, GA, USA
3 Informatics University of Wisconsin–Madison, Madison, WI, USA
4 Hungarian Institute of Cardiology, Budapest, Hungary
5 Rush University Medical Center, Chicago, IL, USA
6 Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
7 AstraZeneca R&D Mölndal, Mölndal, Sweden
8 Mount Sinai Medical Center, New York, NY, USA
Received 11 November 2005; revised 15 May 2006; accepted 26 May 2006; online publish-ahead-of-print 14 June 2006.
* Corresponding author. Tel: 1 773 702 5589; fax: 1 773 834 1764. E-mail address: mgomberg{at}medicine.bsd.uchicago.edu
See page 1893 for the editorial comment on this article (doi:10.1093/eurheartj/ehl140)
Aims The risk of stroke is greater among women with atrial fibrillation (AF) than men. Warfarin protects against stroke, but treatment-related bleeding occurs more often in women than in men.
Methods and results SPORTIF III (open label, n=3410) and V (double-blind, n=3922) included 2257 women with AF and one or more stroke risk factors randomized to warfarin [target international normalized ratio (INR) 2.0–3.0] or ximelagatran (36 mg twice daily). Primary outcomes were all stroke (ischaemic/haemorrhagic) and systemic embolic event. Women were older, on average, than men, 73.4±8.0 vs. 69.8±9.0 years (P<0.0001). More women were >75-years old and women had more risk factors than men had (P<0.0001). The INR on warfarin (mean 2.5±0.7) was within target range for 67% of follow-up regardless of gender. Women more often developed primary events [2.08%/year, 95% confidence interval (CI) 1.60–2.56%/year vs. 1.44%/year, 95% CI 1.18–1.71%/year in men; P=0.016). Major bleeding rates were similar (P=0.766) but women experienced more overall (major/minor) bleeding (P<0.001). Warfarin was associated with more overall bleeding in both genders and more major bleeding in women than in men (P=0.001).
Conclusion When compared with men with AF, women in these studies were older and had more stroke risk factors. Women were more prone to anticoagulant-related bleeding; the higher rate of thrombo-embolism among women was related to more frequent interruption of anticoagulant therapy.
Key Words: Atrial fibrillation • Women • Anticoagulation • Thromboembolism
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