Previously, we conducted a randomised, controlled trial of paramedic cooling after CPR compared with cooling in the emergency department (ED) (NHMRC study number 236879). This study enrolled 396 patients between 2005 and late 2007. There were 234 patients with an initial cardiac rhythm of ventricular fibrillation (VF) and 163 patients with an initial cardiac rhythm of non-VF (asystole or pulseless electrical activity).