Abstract Body: Aims
The primary objective of this study was to investigate ethnic disparities in out-of-hospital cardiac arrest (OHCA) interventions, specifically the administration of epinephrine and ant arrythmias. The secondary objective was to explore the association with the provision of bystander CPR (CPR) and the application of Automated External Defibrillator (AED).

Methods
This was a retrospective analysis of data from the Salt Lake City Fire Department from 2010 to 2023. The study included adults 18 years or older who experienced OHCA and were treated by EMS. Ethnicity was categorized as Whites, Blacks, Hispanics, Asians, and others. Multivariable regression analysis was used to examine the association between ethnicity and the specified outcomes.

Results
Unadjusted analyses revealed no significant differences across ethnic groups in epinephrine and antiarrhythmic medication administration and bystander CPR. However, significant ethnic disparities were observed in AED use: the Asian population had the highest rate (21.8%), while the Black population had the lowest (6.5%). The multivariable analysis found no significant association between ethnicity and any OHCA interventions examined in this study.

Conclusions
Our multivariable analysis did not reveal any statistically significant association between ethnicity and various OHCA interventions, including epinephrine administration, antiarrhythmic medication use, bystander CPR, and AED intervention in Salt Lake City. These findings suggest that regional differences in ethnic disparities in OHCA may vary across locations, emphasizing the need for further research into disparities in other regions and the impact of factors such as socioeconomic status and neighborhood conditions.