Introduction:
Cardiopulmonary resuscitation (CPR) and early defibrillation are two of the most important factors for survival after out-of-hospital cardiac arrest (OHCA). However, little is known whether bystander interventions and survival are impaired in rural areas compared to more urbanized areas in Denmark. We hypothesized that bystander interventions and survival are lower in rural areas compared to urbanized areas.
Methods:
We included all non-EMS witnessed OHCAs with known GPS-location in Denmark (January 1, 2016 to December 31, 2019) and geocoded them according to county. All counties in Denmark were classified either as urban, suburban, or rural according to the degree of urbanization tool defined by the European Statistical Agency.
Results:
A total of 16,670 OHCAs were included, of which 4,555 (27%), 5,457 (33%), and 6,658 (40%) arrests occurred in urban, suburban, and rural areas respectively. The median age (73 vs. 74 vs. 73 years, p=0.003), ambulance response time (6 vs. 7 vs. 8 minutes, p<0.0001), and proportion of arrests occurring in residential areas (77 vs. 79 vs. 78%, p=0.05) differed significantly between degrees of urbanization (from high to low). Fewer OHCAs received bystander CPR in urban and suburban areas compared to rural (76 vs. 77 vs. 79%, p=0.0002). The proportion of patients defibrillated by bystanders remained equal across urbanization. However, return of spontaneous circulation (ROSC) (27 vs. 27 vs. 24%, p<0.0001) and 30-day survival was lower in rural areas (15 vs. 14 vs. 12, p<0.0001) (Figure 1).
Conclusion:
Degree of urbanization was associated with increased rates of bystander CPR in rural areas. Despite this, ROSC and 30-day survival were higher in urban and suburban areas compared to rural areas which could not be explained by cardiac arrest characteristics.