Adrenaline, vasopressin and steroids arm (intervention)

1. At randomization

   1 ml of vasopressin 20 IU/ml will be administered as soon as possible after adrenaline during the five first cycles of drug administration during CPR.

   1 ml metylprednisolone sodium succinate 40 mg/ml will be administered only during the first cycle of drug administration during CPR

2. In the ICU Hydrocortisone 3 mg/ml At 4 hours post ROSC, and then once daily, surviving patients with post-resuscitation shock will receive an infusion of 100 ml (300 mg hydrocortisone/ d) for ≤ 7 days. From day 8 post ROSC or when vasopressors are not needed the hydrocortisone dos will be reduced daily to 67 ml (200 mg) and 33 ml (100 mg) and then discontinued). Patients with evidence of acute myocardial infarction will receive an infusion of 100 ml (300mg hydrocortisone/ d) for maximum 3 days to prevent retardation of infarct healing.

Adrenaline alone arm (control)

1. At randomization 1 ml sodium chloride 9 mg/ml (placebo) will be administered as soon as possible after adrenaline during the first five cycle of drug administration during CPR 1 ml sodium chloride 9 mg/ml (placebo) will be administered only during the first cycle of drug administration during CPR

b In the ICU sodium chloride 9 mg/ml (placebo) At 4 hours post ROSC, and then once daily, surviving patients with post-resuscitation shock will receive an infusion of 100 ml for ≤ 7 days. From day 8 post ROSC or when vasopressors are not needed the dos will be reduced daily to 67 ml and 33 ml and then discontinued. Patients with evidence of acute myocardial infarction will receive an infusion of 100 ml for 3 days.

Vasopressin, the vasoconstrictive hypophysal hormone, alone has not shown increased survival when compared to adrenaline. However, animal data have shown increased diastolic pressure, cerebral perfusion pressure and cerebral oxygenation in cardiac arrest treatment with vasopressin, and have when compared to adrenaline been associated with better cerebral blood flow.

Corticosteroids are currently used in septic shock treatment as a means to reduce time to shock reversal and thereby potentially improving mortality. Steroids have therefore also been suggested for cardiac arrest treatment. The potential role in resuscitation includes the catecholaminerg potentiation, vasoconstriction and protection from reperfusion injury.

Survival at 30 days