Thrombo-inflammation Biomarkers Trial in Acute Cerebral Hypoxia

Inclusion Criteria: \- For cases, admitted within the first 36 hours of an acute neurological symptom related to : * An ischaemic cerebrovascular accident (iCVA) eligible for a mechanical thrombectomy procedure, * A subarachnoid haemorrhage (SAH, all aetiologies) : patient presenting with at least a modified Fisher scale 3 or 4, * An intra-parenchymal haematoma (IPH) with greatest axis ≥ 20mm or with NIHSS on admission \>4. OR * For control patients, admitted within 7 days of the onset of acute neurological symptomatology related to a clinical diagnosis of transient ischaemic attack (TIA) - based on thorough questioning of the patient on admission - and prior to imaging, with an ABCD2≥ 2 score. * Express consent to participate in the study. * Member or beneficiary of a social security. Exclusion Criteria: * Pre-existing functional and/or cognitive disability * Patient under legal protection. * Pregnant or breastfeeding woman. * Patient with secondary haemorrhagic transformation. Secondary exclusion criteria : * Patients with an ischaemic lesion visible on imaging, unrelated to large vessel occlusion and therefore ineligible for mechanical thrombectomy. * Patients diagnosed with an acute non-vascular neurological pathology (migraine, epilepsy, etc.). * TIA patients presenting an abnormality on follow-up imaging 24-48 hours after the initial imaging. Excluded patients will be replaced.