Association of Degree of Urbanization and Survival in Out-of-Hospital Cardiac Arrest

• Published in: Journal of the American Heart Association Vol. 12; no. 10; p. e8322
• Main Authors: Gregers, Mads Christian Tofte, Møller, Sidsel Gamborg, Kjoelbye, Julie Samsoe, Jakobsen, Louise Kollander, Grabmayr, Anne Juul, Kragh, Astrid Rolin, Hansen, Carolina Malta, Torp-Pedersen, Christian, Andelius, Linn, Ersbøll, Annette Kjær, Folke, Fredrik
• Format: Journal Article
• Language: English
• Published: England John Wiley and Sons Inc 16-05-2023; Wiley
• Subjects: Ambulances; bystander interventions; Cardiopulmonary Resuscitation; degree of urbanization; Emergency Medical Services; Humans; Logistic Models; Original Research; Out-of-Hospital Cardiac Arrest - epidemiology; Out-of-Hospital Cardiac Arrest - therapy; out‐of‐hospital cardiac arrest; survival; Urbanization; bystander interventions; degree of urbanization; out‐of‐hospital cardiac arrest; survival
• ISSN: 2047-9980; 2047-9980
• DOI: 10.1161/JAHA.122.028449

Background Survival from out-of-hospital cardiac arrest (OHCA) varies across regions. The aim of this study was to evaluate the association between urbanization (rural, suburban, and urban areas), bystander interventions (cardiopulmonary resuscitation and defibrillation), and 30-day survival from OHCAs in Denmark. Methods and Results We included OHCAs not witnessed by ambulance staff in Denmark from January 1, 2016, to December 31, 2020. Patients were divided according to the Eurostat Degree of Urbanization Tool in rural, suburban, and urban areas based on the 98 Danish municipalities. Poisson regression was used to estimate incidence rate ratios. Logistic regression (adjusted for ambulance response time) tested differences between the groups with respect to bystander interventions and survival, according to degree of urbanization. A total of 21 385 OHCAs were included, of which 8496 (40%) occurred in rural areas, 7025 (33%) occurred in suburban areas, and 5864 (27%) occurred in urban areas. Baseline characteristics, as age, sex, location of OHCA, and comorbidities, were comparable between groups. The annual incidence rate ratio of OHCA was higher in rural areas (1.54 [95% CI, 1.48-1.58]) compared with urban areas. Odds for bystander cardiopulmonary resuscitation were lower in suburban (0.86 [95% CI, 0.82-0.96]) and urban areas (0.87 [95% CI, 0.80-0.95]) compared with rural areas, whereas bystander defibrillation was higher in urban areas compared with rural areas (1.15 [95% CI, 1.01-1.31]). Finally, 30-day survival was higher in suburban (1.13 [95% CI, 1.02-1.25]) and urban areas (1.17 [95% CI, 1.05-1.30]) compared with rural areas. Conclusions Degree of urbanization was associated with lower rates of bystander defibrillation and 30-day survival in rural areas compared with urban areas.