A potential termination of resuscitation rule for EMS to implement in the field for out-of-hospital cardiac arrest: An observational cohort study

Based on three objective variables: unshockable initial rhythm, unwitnessed by bystanders, and age ≥73 years, which can be collected immediately after the arrival of EMS personnel at the scene, a new TOR can be developed. Our potential new TOR rule provided an excellent PPV (>99%) for unfavourable neurological outcomes at one month after OHCA.