Antiplatelet therapy is effective in the prevention of stroke or death in women: subgroup analysis of the European stroke prevention study (ESPS)

Previous stroke prevention studies have suggested that the efficacy of antiplatelet therapy may be less in women than in men. This however, could be due to the small number of women in these trials and the low incidence of cases among female subjects. The European Stroke Prevention Study was a multicenter trial comparing the effect of a combination of dipyridamole 75 mg t.i.d and acetylsalicylic acid 330 mg t.i.d. to placebo in the secondary prevention of stroke or death after one or more recent attacks of TIA (transient ischemic attack), RIND (reversible ischemic neurological deficit) or stroke of atherothrombotic origin. From the 2500 patients recruited, 1307 patients were from a single center, Kuopio, East Finland. Forty-five percent of the patients were women. The number of end-point events (stroke or death from any cause) in women was one-third lower than that in men. End-point reduction in the treatment group was about 50% in women and about 40% in men, significantly lower than in the placebo group in both sexes. Thus, in the relatively randomly selected patient population from one Finnish center, a combination of dipyridamole and acetylsalicylic acid is as effective in women as in men in the prevention of stroke or death. It is unclear, however, whether this beneficial effect in both sexes is due to aspirin only or to the combination therapy of aspirin and dipyridamole.