Sudden cardiac death remains one of the major leading causes of death. Therapeutic hypothermia is a validated standard procedure to avoid or minimize cognitive deficits after cardiac arrest. To assess the efficiency of different cooling methods and further improve these methods, the investigators collected blood samples to measure the neuron specific enolase (NSE) in patients treated with invasive cooling as compared to patients treated with non-invasive cooling.

Consecutive patients with restoration of spontaneous circulation after resuscitation due to sudden cardiac death were randomized to either non-invasive or invasive cooling for at least 24 hours. NSE was collected at designated time points and compared between patients treated with invasive cooling and those treated with non-invasive cooling. Neurological outcome was assessed between groups at hospital discharge and 6 months after discharge.

Inclusion Criteria:

• ROSC after sudden cardiac death (SCA) due to VF/VT or PEA/Asystolia
• GCS 3

Exclusion Criteria:

• Non-cardiac sudden death
• Pregnancy
• Unstable circulation with high-dose inotropics
• Life-expectancy reducing concomitant illness

Patients who survived sudden cardiac arrest and where treated with cooling-therapies