Determinants of Vasospasm and Delayed Ischemic Deficits in Aneurysmal Subarachnoid Hemorrhage

Inclusion Criteria: Group 1 : • Patients who presented a ruptured aneurysm by aneurysmal subarachnoid hemorrhage (SAH) older than 72 hours. Diagnosis of SAH was confirmed by computed tomography, magnetic resonance imaging (MRI) or lumbar puncture as recommended * symptomatic aneurysm treated with endovascular, * Absence of achieving a lumbar puncture, * Patients affiliated to a social security scheme, * Patients who have given their free and informed consent and signed the consent or consent of the family. Group 2 : healthy volunteers with cerebrospinal fluid sample Exclusion Criteria: * Patients with no readable acoustic temporal bone window * Patients with previous disease that might impair cerebral autoregulation (e.g., carotid stenosis, history of stroke or head injury).