Background
Survival following out-of-hospital cardiac arrest (OHCA) varies nationally1 and internationally.2 Across all cases of OHCA, survival to discharge from hospital is reported as less than 10%.1 
In the area of Odense, Denmark (population 260.000), patients with OHCA are treated by a prehospital physician-manned mobile emergency care unit (MECU) and transported directly to the cardiac catheterization laboratory at a specialized tertiary center following OHCA of suspected cardiac origin.
Purpose
To report the survival rate for patients with OHCA treated within an optimized prehospital and in-hospital system with immediate access to cardiac catheterization.3
Methods
Manual review of all prehospital medical records of patients treated by the MECU from 2011-2016.
Patients declared dead by the MECU physician immediately upon arrival were excluded.
Primary outcome was survival at 30 days. Secondary outcomes were patient transported or declared dead, ROSC at any time, and survival at 24 hours.
Results
During six years, 900 patients (67.3% male) with OHCA were treated by the MECU. In 484 patients (53.8%), treatment was terminated on scene, and the patient was declared dead before transport. 416 patients (46.2%) were transported to hospital.  379 patients (42.1%) had ROSC. 286 patients (31.8%) were alive at 24 hours. 164 patients (18.2%) lived at 30 days. 
Adjusted according to the size of the population of the catchment area, these figures translated to 24.3 patients achieving ROSC, 18.3 survivors at 24 hours, and 10.5 survivors at 30 days per 100.000 inhabitants/year.
Conclusion
Physician-directed treatment of OHCA in a prehospital emergency system working in close collaboration with a tertiary center with a 24/7/365 cardiac catheterization service may result in higher survival rates than generally reported from western countries.

1 - Survival following treatment of out-of-hospital cardiac arrest in a physician-manned prehospital emergency system with immediate access to a cardiac catheterization laboratory