Intraventricular Fibrinolysis for Aneurysmal Subarachnoid Hemorrhage.

Inclusion Criteria: * Patients (age 18-75) with SAH on initial CT-Scan examination. * SAH associated with hydrocephalus requiring external ventricular drainage. * Confirmation of an associated intracranial aneurysm by vascular imaging. * Time from onset to admission under 24 hours. * Exclusion of the aneurysm by surgical clipping or endovascular coiling before IVF. * Oral information on research and informed consent of the patient and/or his relatives. Exclusion Criteria: * Patient with severe clinical presentation on admission: WFNS score = 5. * Associated intracerebral hematoma of more than 2 cm in its larger width. * SAH diagnosed on lumbar puncture: original Fisher grade = 1. * Impossibility to exclude the aneurysm within 72 hours following its rupture. * Patient previously treated with antiplatelet therapy or treated with antiplatelet therapy after the aneurysm exclusion. * Severe coagulopathy, including oral vitamin K antagonist. * Pregnant or lactating woman.