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Original Article
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Volume 359:1317-1329 September 25, 2008 Number 13
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Thrombolysis with Alteplase 3 to 4.5 Hours after Acute Ischemic Stroke
Werner Hacke, M.D., Markku Kaste, M.D., Erich Bluhmki, Ph.D., Miroslav Brozman, M.D., Antoni Dávalos, M.D., Donata Guidetti, M.D., Vincent Larrue, M.D., Kennedy R. Lees, M.D., Zakaria Medeghri, M.D., Thomas Machnig, M.D., Dietmar Schneider, M.D., Rüdiger von Kummer, M.D., Nils Wahlgren, M.D., Danilo Toni, M.D., for the ECASS Investigators

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ABSTRACT

Background Intravenous thrombolysis with alteplase is the only approved treatment for acute ischemic stroke, but its efficacy and safety when administered more than 3 hours after the onset of symptoms have not been established. We tested the efficacy and safety of alteplase administered between 3 and 4.5 hours after the onset of a stroke.

Methods After exclusion of patients with a brain hemorrhage or major infarction, as detected on a computed tomographic scan, we randomly assigned patients with acute ischemic stroke in a 1:1 double-blind fashion to receive treatment with intravenous alteplase (0.9 mg per kilogram of body weight) or placebo. The primary end point was disability at 90 days, dichotomized as a favorable outcome (a score of 0 or 1 on the modified Rankin scale, which has a range of 0 to 6, with 0 indicating no symptoms at all and 6 indicating death) or an unfavorable outcome (a score of 2 to 6 on the modified Rankin scale). The secondary end point was a global outcome analysis of four neurologic and disability scores combined. Safety end points included death, symptomatic intracranial hemorrhage, and other serious adverse events.

Results We enrolled a total of 821 patients in the study and randomly assigned 418 to the alteplase group and 403 to the placebo group. The median time for the administration of alteplase was 3 hours 59 minutes. More patients had a favorable outcome with alteplase than with placebo (52.4% vs. 45.2%; odds ratio, 1.34; 95% confidence interval [CI], 1.02 to 1.76; P=0.04). In the global analysis, the outcome was also improved with alteplase as compared with placebo (odds ratio, 1.28; 95% CI, 1.00 to 1.65; P<0.05). The incidence of intracranial hemorrhage was higher with alteplase than with placebo (for any intracranial hemorrhage, 27.0% vs. 17.6%; P=0.001; for symptomatic intracranial hemorrhage, 2.4% vs. 0.2%; P=0.008). Mortality did not differ significantly between the alteplase and placebo groups (7.7% and 8.4%, respectively; P=0.68). There was no significant difference in the rate of other serious adverse events.

Conclusions As compared with placebo, intravenous alteplase administered between 3 and 4.5 hours after the onset of symptoms significantly improved clinical outcomes in patients with acute ischemic stroke; alteplase was more frequently associated with symptomatic intracranial hemorrhage. (ClinicalTrials.gov number, NCT00153036 [ClinicalTrials.gov] .)


Source Information

From the Department of Neurology, Universität Heidelberg, Heidelberg, Germany (W.H.); the Department of Neurology, Helsinki University Central Hospital, Helsinki (M.K.); the Department of Statistics, Boehringer Ingelheim, Biberach, Germany (E.B.); the Neurology Clinic, University Hospital Nitra, Nitra, Slovakia (M.B.); the Department of Neurosciences, Hospital Universitari Germans Trias i Pujol, Barcelona (A.D.); the Department of Neurology, Hospital of Piacenza, Piacenza, Italy (D.G.); the Department of Neurology, University of Toulouse, Toulouse, France (V.L.); the Faculty of Medicine, University of Glasgow, Glasgow, United Kingdom (K.R.L.); Boehringer Ingelheim, Reims, France (Z.M.); Boehringer Ingelheim, Ingelheim, Germany (T.M.); the Department of Neurology, Universität Leipzig, Leipzig, Germany (D.S.); the Department of Neuroradiology, Technische Universität Dresden, Dresden, Germany (R.K.); the Department of Neurology, Karolinska Institutet, Stockholm (N.W.); and the Department of Neurological Sciences, University La Sapienza, Rome (D.T.).

Address reprint requests to Dr. Hacke at the Department of Neurology, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany, or at werner.hacke{at}med.uni-heidelberg.de.

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Related Letters:

Thrombolysis 3 to 4.5 Hours after Acute Ischemic Stroke
Torbey M. T., Jauch E., Liebeskind D. S., the Acute Stroke Advisory Board of the National Stroke Association , Fitzpatrick A. E., Noone I., O'Shea D. D., Schwamm L. H., Fonarow G. C., Morris D. C., Hacke W., Kaste M., Toni D.
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N Engl J Med 2008; 359:2839-2841, Dec 25, 2008. Correspondence

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