Measuring intra-arrest transport in out-of-hospital cardiac arrest: A methodological study of registry-compatible definitions.

Introduction: For out-of-hospital cardiac arrest (OHCA) with refractory arrest, transport to hospital with ongoing cardiopulmonary resuscitation (CPR)-"intra-arrest transport (IAT)"-is a treatment option, however it may reduce resuscitation quality. Unfortunately, international registries do not measure IAT directly, but other variables may be used to estimate IAT. We compared three indirect definitions to a direct measurement of IAT.