RT Journal Article SR Electronic T1 Rationale, development and implementation of the ReACanROC registry for out-of-hospital cardiac arrests in France and Canada JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 547 OP 553 DO 10.1136/emermed-2020-211073 VO 39 IS 7 A1 Matthieu Heidet A1 Hervé Hubert A1 Brian E Grunau A1 Sheldon Cheskes A1 Valentine Baert A1 Laurie Fraticelli A1 Julie Freyssenge A1 Eric Lecarpentier A1 Audra Stitt A1 John M Tallon A1 Karim Tazarourte A1 Courtney Truong A1 Christian Vaillancourt A1 Christian Vilhelm A1 Kosma Wysocki A1 Jim Christenson A1 Carlos El Khoury A1 , YR 2022 UL http://emj.bmj.com/content/39/7/547.abstract AB France and Canada prehospital systems and care delivery in out-of-hospital cardiac arrests (OHCAs) show substantial differences. This article aims to describe the rationale, design, implementation and expected research implications of the international, population-based, France-Canada registry for OHCAs, namely ReACanROC, which is built from the merging of two nation-wide, population-based, Utstein-style prospectively implemented registries for OHCAs attended to by emergency medical services. Under the supervision of an international steering committee and research network, the ReACanROC dataset will be used to run in-depth analyses on the differences in organisational, practical and geographic predictors of survival after OHCA between France and Canada. ReACanROC is the first Europe-North America registry ever created to meet this goal. To date, it covers close to 80 million people over the two countries, and includes approximately 200 000 cases over a 10-year period.