Lars Øivind Høiseth1,2, Jostein S Hagemo3,4. 1. Department of Anesthesiology, Division of Emergencies and Critical Care, Oslo University Hospital, Kirkeveien 166, 0368, Oslo, Norway. lars.oivind.hoiseth@hotmail.com. 2. Division of Cardiovascular and Pulmonary Diseases, Oslo University Hospital, Oslo, Norway. lars.oivind.hoiseth@hotmail.com. 3. Norwegian Air Ambulance Foundation, Drøbak, Norway. 4. Division of Prehospital Care, Oslo University Hospital, Oslo, Norway.