Dataset from ECASS III - European Cooperative Acute Stroke Study III: A Placebo Controlled Trial of Alteplase (Rt-PA) in Acute Ischemic Hemispheric Stroke Where Thrombolysis is Initiated Between 3 and 4 Hours 30 Minutes After Stroke Onset

To collect additional confirmatory data on alteplase(rt-PA) in the European setting and to demonstrate that the treatment of patients between 3 and 4.30 hours of onset of symptoms of acute ischemic stroke with rt-PA compared to placebo-treated patients will result in an improved clinical outcome without increase of fatality rate.