PMID: 9174558May 31, 1997Paper

The International Stroke Trial (IST): a randomised trial of aspirin, subcutaneous heparin, both, or neither among 19435 patients with acute ischaemic stroke. International Stroke Trial Collaborative Group

Lancet

Abstract

Only a few small trials have compared antithrombotic therapy (antiplatelet or anticoagulant agents) versus control in acute ischaemic stroke, and none has been large enough to provide reliable evidence on safety or efficacy. The International Stroke Trial (IST) was a large, randomised, open trial of up to 14 days of antithrombotic therapy started as soon as possible after stroke onset. The aim was to provide reliable evidence on the safety and efficacy of aspirin and of subcutaneous heparin. Half the patients were allocated unfractionated heparin (5000 or 12,500 IU bd [twice daily]), and half were allocated "avoid heparin"; and, in a factorial design, half were allocated aspirin 300 mg daily and half "avoid aspirin". The primary outcomes were death within 14 days and death or dependency at 6 months. 19,435 patients with suspected acute ischaemic stroke entering 467 hospitals in 36 countries were randomised within 48 hours of symptom onset. Among heparin-allocated patients, there were non-significantly fewer deaths within 14 days (876 [9.0%] heparin vs 905 [9.3%] no heparin), corresponding to 3 (SD 4) fewer deaths per 1000 patients. At 6 months the percentage dead or dependent was identical in both groups (62.9%). Patients alloc...Continue Reading

Associated Clinical Trials

References

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