Inclusion Criteria:  Adult patient Admitted to an intensive care unit Patient having presented a state of circulatory shock, defined by the need for continuous administration of a vasopressive amine for at least one hour, among: Noradrenaline, Adrenaline In whom the introduction of drug treatment for antihypertensive purposes is decided  Exclusion Criteria:  Patient admitted to intensive care for a hypertensive emergency (hypertensive surge or malignant arterial hypertension leading to organ dysfunction Patient who has already received at least one anti-hypertensive drug during his stay in intensive care Cerebro-injured patient, proven or suspected cerebral edema, head trauma <1 month, decrease in cerebral perfusion measured Proven or suspected active bleeding Patient refusal of participation