Transitions Between Circulatory States After Out-of-Hospital Cardiac Arrest: Protocol for an Observational, Prospective Cohort Study

Halvor Langeland   ^{1, 2 *} , MD ;   Daniel Bergum   ^{1, 3 *} , MD, PhD ;   Magnus Løberg   ^{4, 5 *} , MD, PhD ;   Knut Bjørnstad   ^{6 *} , MD, PhD ;   Jan Kristian Damås   ^{3, 7, 8 *} , MD, PhD ;   Tom Eirik Mollnes   ^{7, 9, 10, 11 *} , MD, PhD ;   Nils-Kristian Skjærvold   ^{1, 2 *} , MD, PhD ;   Pål Klepstad   ^{1, 2 *} , MD, PhD

¹ Department of Anesthesiology and Intensive Care Medicine, St Olav’s University Hospital, Trondheim, Norway

² Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, The Norwegian University of Science and Technology, Trondheim, Norway

³ Mid-Norway Sepsis Research Center, Norwegian University of Science and Technology, Trondheim, Norway

⁴ Institute of Health and Society, Department of Health Management and Health Economics, Faculty of Medicine, University of Oslo, Oslo, Norway

⁵ KG Jebsen Center for Colorectal Cancer Research, Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway

⁶ Clinic of Cardiology, St Olav’s University Hospital, Trondheim, Norway

⁷ Centre of Molecular Inflammation Research, Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway

⁸ Department of Infectious Diseases, St Olav’s University Hospital, Trondheim, Norway

⁹ KG Jebsen Inflammation Research Center, Department of Immunology, Oslo University Hospital, Oslo, Norway

¹⁰ Research Laboratory, Nordland Hospital, Bodø, Norway

¹¹ KG Jebsen Thrombosis Research and Expertise Center, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway

*all authors contributed equally