All patients treated for cardiac arrest, meeting our inclusions criteria will be enrolled in the study. No interventions regarding the national guidelines will be jeopardized, as the plasma concentration following a single dose of epinephrine will be measured in all patient.

This is truly an observational study to determine T1/2 for epinephrine and time to peak concentration following a single dose of epinephrine in a cardiac arrest setting

Blood concentration of epinephrine will be determined the first five minutes following administration. For every minute starting With administration of epinephrine, blood samples will be drawn to determine the concentration (ng/mL). In total, six samples will be drawn. The administered dose (1 mg) will also be related to the patients weight, either estimated, or for those survivors admitted to hospital, measured in the Intensive Care Unit. Further, data according to the Utstein-template will be recorded.However, the primary outcome is to determine the plasma concentrations in every patients the first five minutes.