Background: One of the 2010 Impact Goals of the Emergency Cardiac Care (ECC) Committee of the American Heart Association is to double survival from cardiac arrest. Currently, approximately 60% of adults and 50% of paediatric patients that regain spontaneous circulation following cardiac arrest die before leaving the hospital. A key piece of the "chain of survival" is this fifth link; the care of patients post-arrest. Although there are several modalities recommended for post arrest care, therapeutic hypothermia is the only in-hospital therapy that has been demonstrated in randomized clinical trials to improve patient outcome after cardiac arrest. Despite the strong evidence for its efficacy and the apparent simplicity of this intervention, recent surveys show that hypothermia is delivered inconsistently, incompletely, and with undue delay in hospitals receiving resuscitated patients; only 26% of physicians and 26% of hospitals regularly institute a hypothermia protocol.

Primary Objective: To design and apply a knowledge translation program for the 2005 AHA guideline on hypothermia post cardiac arrest and enable effective implementation of hypothermia in 100% of eligible OHCA patients. The integration of two robust data collection systems, which include both pre-hospital and in-hospital indicators, will give complete process of care and clinical outcome information for all cardiac arrest patients.

Primary Endpoint: the proportion of eligible out of hospital cardiac arrest patients cooled to 32-34°C within 6 hours of ED arrival.

Study Design: This project will be implemented through an established research collaborative of 43 hospitals in southern Ontario currently participating in the Toronto site of the Resuscitation Outcomes Consortium. A stepped wedge study design will be employed, whereby the intervention will be rolled-out sequentially to the participating hospitals over a number of time periods as sites reach pre-defined benchmarks. The multifaceted KT strategy will include 1) local multidisciplinary champions in ED, ICU, and Cardiology 2) A simple protocol for application of hypothermia, tailored to local needs and policy; 3) Identification of perceived and actual barriers to knowledge use; 4) Development of an implementation tool kit and 5) Providing timely feedback on benchmarks for hypothermia and outcomes