56 The 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 2025, which stratifies arrests by witness status and presenting rhythm. In 2025, the survival to hospital discharge rate for the Utstein subgroup was 33.2%. 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 37.0%. Utstein Survival Figure 20. 2025 CARES Non-Traumatic Etiology Utstein Survival Report. Utstein Survival Report All Agencies/National Data Date of Arrest: 01/01/25-12/31/25 - Non-Traum atic Etiology Survival Rates Overall: 10.5% (140427) Bystander Wit'd: 16.1%(53268) Unwitnessed: 4.3% (69462) Utstein¹: 33.2% (15550) Utstein Bystander²: 37.0% (9509) Bystander Intervention Rates ³ CPR: 42.5% (104627) Public AED Use: 13.9% (17992) Resuscitations Attempted 143512 Trauma Etiology 3085 Non-Traumatic Etiology 140427 Unwitnessed Arrest 69462 *see page 2 Witnessed by 911 Responder 17695 *see page 3 Witnessed by Bystander 53268 Initial Rhythm Asystole 19606 Sustained ROSC in field = 3707 Other Initial Rhythm 18112 Sustained ROSC in field = 6053 Initial Rhythm VF/VT 15550 Sustained ROSC in field = 6909 Died in Field 9406 Died in ED 6313 Died in Field 2665 Died in ED 4768 Died in Field 5360 Died in ED 6369 Admitted to Hospital 3888 (29 incomplete) Admitted to Hospital 8117 (56 incomplete) Admitted to Hospital 6383 (35 incomplete) Died In Hospital 3100 Died In Hospital 2895 Died In Hospital 3704 Discharged Alive 759 Discharged Alive 5166 Discharged Alive 2644 Neurological Status CPC 1 or 2 397 CPC 3 or 4 362 Unknown = 0 Neurological Status CPC 1 or 2 4512 CPC 3 or 4 651 Unknown = 3 Neurological Status CPC 1 or 2 2020 CPC 3 or 4 621 Unknown = 3
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