Abstract 265: Impact of Changes in the Telephone Cardiopulmonary Resuscitation Instruction After Out-of-Hospital Cardiac Arrest

Abstract

Background: The international consensus on cardiopulmonary resuscitation (CPR) and emergency cardiovascular care science with treatment recommendations (CoSTR) 2010 changed the dispatcher-initiated telephone CPR instruction. Major changes of the telephone CPR instruction were simplified algorithm, elimination of “Look, listen, and feel for breathing” chest compressions first (C-A-B), chest compression only CPR if bystander was not trained in CPR, et al. However, few studies have investigated the efficacy of telephone CPR instruction based on the CoSTR 2010. Methods: From the All-Japan Utstein Registry for out-of-hospital cardiac arrest (OHCA) between 2006 and 2015, we enrolled adult (18 years or older) patients with bystander-witnessed OHCA and stratified by the two CoSTR eras (the CoSTR 2010 group from 2011 through 2015 versus the CoSTR 2005 group from 2006 through 2010). The primary endpoint was 30-day favorable neurological outcome after OHCA. Results: Of the 378,757 adult patients with bystander-witnessed OHCA, 199,117 (52.5%) received CPR based on the CoSTR 2010 and 179,640 (47.4%) received CPR based on the CoSTR 2005. In the whole cohort, the CoSTR 2010 group had higher proportion of cases receiving telephone CPR instruction than the CoSTR 2005 group (48.8% versus 40.9%, P<0.001). In the subgroups of patients receiving telephone CPR instruction, the CoSTR 2010 group had higher proportion of bystander chest compression-only CPR (60.5% versus 47.3%, p<0.001) and public access defibrillation (1.9% versus 0.9%, P<0.001) than the CoSTR 2005 group. Although those subgroups had similar proportion of initial shockable cardiac arrest rhythm (15.2 % in the CoSTR 2010 group versus 15.3 % in the CoSTR 2005 group, P=0.63), the CoSTR 2010 group had higher frequency of the favorable neurological outcome than the CoSTR 2005 group (4.5 % versus 3.7%%, P<0.001). In the subgroup of patients receiving telephone CPR instruction, an adjusted odds ratio for the favorable neurological outcome in the CoSTR 2010 group (reference, the CoSTR 2005 group) was 1.47 (95 % CI, 1.43-1.51, p<0.001). Conclusions: Telephone CPR instruction based on the CoSTR 2010 was the preferable approach to resuscitation for adult patients with bystander-witnessed OHCA.