The RACE Scale for Large Vessel Stroke Diversion to a Comprehensive Stroke Center by Helicopter Air Ambulance: A Retrospective Cohort Study.

Objective: Acute ischemic stroke caused by large vessel occlusion (LVO) occurs frequently and benefits from endovascular therapies available at comprehensive stroke centers (CSCs). Prehospital stroke severity tools have been devised to detect LVO. The goal of this study was to assess the value of the Rapid Arterial Occlusion Evaluation (RACE) score in helicopter air ambulance (HAA) activation.