HYdrocortisone and VAsopressin in Post-RESuscitation Syndrome

Inclusion Criteria: * Adult patients (\>18y) * Cardiac arrest (in-hospital or out-of-hospital) with sustained ROSC (\> 30 minutes) admitted to the ICU * Post-resuscitation shock defined as arterial hypotension (SAP \< 90 mmHg or MAP \< 65 mmHg) unresponsive to adequate fluid loading, which occurred within the first 24 hours after ROSC and requiring norepinephrine/epinephrine continuous infusion at a dose greater or equal to 0.2µg/kg/min for at least 3 hours * A maximal delay between the start of norepinephrine infusion and randomization of 9 hours * Informed written consent of the patient or a legally authorized close relative. Exclusion Criteria: * Evidence for a traumatic or a neurological cause of cardiac arrest * Shock due to uncontrolled haemorrhage * Previously known adrenal insufficiency * Limitation of life-sustaining therapies * Ongoing treatment by any steroids, whatever the dose * Ongoing extra-corporeal circulatory assistance * Gastrointestinal bleeding in the past 6 weeks * Pregnant or breastfeeding women * Participation in another interventional study involving human participants or being in the exclusion period at the end of a previous study involving human participants, if applicable * Hypersensitivity to arginin-vasopressin and to its excipients * Hypersensitivity to hydrocortisone and to its excipients * Legal protection (i.e. incompetence to provide consent, guardianship, curator or incarceration) * No affiliation with the French health care system.