b'CARES 2023 Annual ReportUtstein SurvivalThe Utstein template was developed by international resuscitation experts to establish uniform reporting guidelines for clinical variables and patient outcomes related to OHCA. These guidelines define core data fields to ensure consistency in terminology and provide recommendations on the data elements to be recorded for each OHCA event.Patients who experience a bystander witnessed OHCA and present in a shockable rhythm are the most likely to survive their arrest, and are referred to as the Utstein subgroup. This subset of arrests serves as an important measure of system efficacy, allowing for comparison of patient outcomes between systems and time periods, despite the wide variation of cardiac arrest circumstances and patient characteristics.Figure 20 presents the National CARES Utstein Survival Report for 2023, which stratifies arrests by witness status and presenting rhythm. In 2023, the survival to hospital discharge rate for the Utstein subgroup was 32.8%. Utstein bystander patients (arrests witnessed by a bystander, presenting in a shockable rhythm, and receiving some bystander intervention [CPR and/or AED application]) had a survival rate of 36.3%.Figure 20. 2023 CARES Non-Traumatic Etiology Utstein Survival Report.42 43'