Milrinone Infusion for VAsospam Treatment in Subarachnoid hemoRrhage

Inclusion Criteria: * Adult patients hospitalized for aneurysmal SAH * First episode of vasospasm, with a diagnosis confirmed on cerebral arterial CT-scanner * Delay between diagnosis of vasospasm (done by CT-scanner) and inclusion ≤6 hours * Informed consent from a legal representative, or emergency procedure Exclusion Criteria: * Initial Glasgow score at 3 with a bilateral mydriasis * Moribund patient * Contraindication to Milrinone (notably obstructive cardiomyopathy…) * Cerebral infarction in the vasospasm area already present on the CT-scanner at the time of diagnosis (lack of expected benefit of treatment in this case according to medical judgement) * Cardiac failure requiring inotrope administration at the time of randomisation * Uncontrolled elevated intra-cranial pressure (i.e. ICP\>25 mmHg for more than 20 minutes) * Patient with flutter or cardiac arrhythmia (atrial fibrillation) poorly tolerated * Major metabolic disturbance (uncorrected hypokalaemia \<3 mmol/L) * Non-affiliation to French health care coverage, * Pregnant, breastfeeding or parturient woman * Adult deprived of their liberty by judicial or administrative decision * Adult under compulsory psychiatric care * Adult patient protected under the law (guardianship or trusteeship) * Inclusion in an interventional study using Milrinone, or evaluating a treatment of cerebral vasospasm or with the same primary endpoint (mRS at 3 months).