End-Tidal CO2 (ETCO2) Trends in Out-of-Hospital Cardiac Arrest

End-Tidal CO2 (ETCO2) Trends in Out-of-Hospital Cardiac Arrest

The investigators aim to assess the relationship between patient characteristics, prehospital treatments, and vital signs to determine if a threshold EtCO2 value, a change in EtCO2 value (final - initial), or a trend in EtCO2 (positive/negative) is a better predictor of patient survival to discharge. The secondary aim of this project is to identify significant predictors of neurologically intact patient survival as indicated by a cerebral performance category (CPC) score of 1-2.

Inclusion Criteria

• EHR's resulting from 9-1-1 response
• Adult patients (aged 18+ at time of cardiac event)
• experiencing out-of-hospital cardiac arrest (OHCA)
• transported by an agency under OMD oversight
• must have at least 2 EtCO2 values captured during care Exclusion Criteria
• EHR's resulting from inter-facility scheduled or unscheduled medical transfers
• pediatric patients (those aged <18 at time of incident) or unknown age
• ROSC obtained prior to arrival of EMS
• insufficient vital sign data