METHODS: Retrospective chart review was used to identify cardiac arrests with shockable rhythms at a single, large University-affiliated teaching hospital. Code data is recorded in a standardized fashion, which is electronically stored on CodeNet software. Arrests were included if the physician leader was an internal medicine resident. Data collected included resident year, type of arrest, time of identification of shockable rhythm, and time of shock delivered. The pre intervention group consisted of internal medicine residents having received the hospital standard ACLS training. The post intervention consisted of medicine residents having high fidelity critical care case simulations, including simulation of shockable arrest.