1. Documented contraindication to the use of fibrinolytics. 1.1. Internal active bleeding or known history of hemorrhagic diathesis 1.2. History of previous CVA of any kind or at any time 1.3. Intracranial tumor, arteriovenous malformation, aneurysm or cerebral aneurysm repair 1.4. Major surgery, parenchymal biopsy, ocular surgery or severe traumatism in the 6 weeks prior to randomization 1.5. Unexplained puncture in a non-compressible vascular location in the last 24 hours prior to randomization 1.6. Confirmed arterial hypertension with a reliable measurement of systolic AP >180 mmHg or diastolic AP >110 mmHg 1.7. Known thrombocytopenia < 100.000 platelets/mL 1.8. Prolonged (>20 minutes) or traumatic cardiopulmonar resuscitation (CPR) in the 2 weeks prior to randomization 1.9. History or signs suggesting aortic dissection