RT Journal Article SR Electronic T1 Socioeconomic disparities in prehospital factors and survival after out-of-hospital cardiac arrest JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 627 OP 634 DO 10.1136/heartjnl-2020-317761 VO 107 IS 8 A1 Sidsel Møller A1 Mads Wissenberg A1 Liis Starkopf A1 Kristian Kragholm A1 Steen M Hansen A1 Kristian Bundgaard Ringgren A1 Fredrik Folke A1 Julie Andersen A1 Carolina Malta Hansen A1 Freddy Lippert A1 Lars Koeber A1 Gunnar Hilmar Gislason A1 Christian Torp-Pedersen A1 Thomas A Gerds YR 2021 UL http://heart.bmj.com/content/107/8/627.abstract AB Objective It remains unknown whether patient socioeconomic factors affect interventions and survival after out-of-hospital cardiac arrest (OHCA), and whether a socioeconomic effect on bystander interventions affects survival. Therefore, this study examined patient socioeconomic disparities in prehospital factors and survival.Methods From the Danish Cardiac Arrest Registry, patients with OHCA ≥30 years were identified, 2001–2014, and divided into quartiles of household income (highest, high, low, lowest). Associations between income and bystander cardiopulmonary resuscitation (CPR) and 30-day survival with bystander CPR as mediator were analysed by logistic regression and mediation analysis in private witnessed, public witnessed, private unwitnessed and public unwitnessed arrests, adjusted for confounders.Results We included 21 480 patients. Highest income patients were younger, had higher education and were less comorbid relative to lowest income patients. They had higher odds for bystander CPR with the biggest difference in private unwitnessed arrests (OR 1.74, 95% CI 1.47 to 2.05). For 30-day survival, the biggest differences were in public witnessed arrests with 26.0% (95% CI 22.4% to 29.7%) higher survival in highest income compared with lowest income patients. Had bystander CPR been the same for lowest income as for highest income patients, then survival would be 25.3% (95% CI 21.5% to 29.0%) higher in highest income compared with lowest income patients, resulting in elimination of 0.79% (95% CI 0.08% to 1.50%) of the income disparity in survival. Similar trends but smaller were observed in low and high-income patients, the other three subgroups and with education instead of income. From 2002 to 2014, increases were observed in both CPR and survival in all income groups.Conclusion Overall, lower socioeconomic status was associated with poorer prehospital factors and survival after OHCA that was not explained by patient or cardiac arrest-related factors.