Outcomes
The primary outcome was survival to hospital discharge. Secondary outcomes were a return of spontaneous circulation at the end of EMS care and a favorable neurologic status at the time of hospital discharge, defined as a Cerebral Performance Category (CPC) of 1 or 2. (There are five CPC categories; category 1 represents good cerebral performance, 2 moderate cerebral disability, 3 severe cerebral disability, 4 coma or vegetative state, and 5 death.20,21)