ENO2 and ventricular fibrillation: In the current study, a post hoc analysis of the COMACARE trial, we assessed the associations between cerebral oxygenation and serum neuron-specific enolase (NSE) concentrations and between cerebral oxygenation and neurological outcome in patients resuscitated from ventricular fibrillation (VF) or ventricular tachycardia (VT).