Abstract 171: Effect of Shock Delivery After Conversion to Shockable Arrest From Out-of-Hospital Non-shockable Cardiac Arrest

Background: The 2005 guidelines for cardiopulmonary resuscitation (CPR) with electrical therapy recommended a single shock plus an immediate 2 minutes of CPR instead of 3-shock sequences recommended in the 2000 guidelines. The 2010 guidelines have stressed that it is necessary to improve CPR quality. Each set of guidelines recommended a timely shock when non-shockable patients were found to be in shockable rhythm. Few data are available concerning this electrical therapy. METHODS: From the data of the All-Japan Utstein Registry, a prospective, nationwide, population-based registry of out-of-hospital cardiac arrest (OHCA), we included adult patients who had OHCA due to cardiac etiology, in whom non-shockable arrest were recorded as an initial rhythm, and who received shock after conversion from non-shockable arrest to shockable arrest by emergency medical service (EMS) personnel. Study patients were divided into three groups based on the different guidelines; 3-shock protocol of the 2000 guidelines, single...