Kitamura T, et al. - Researchers here aimed to assess the optimal type of cardiopulmonary resuscitation (CPR)(chest compression-only CPR [CCCPR] or conventional CPR with rescue breathing [CCRB]) to be performed by bystanders when they witness someone collapse. They recognized chest CCCPR as an acceptable resuscitation technique for lay-rescuers responding to bystander witnessed out-of-hospital cardiac arrest of presumed medical origin. The multivariate analysis revealed more favorable neurological outcome with the CCCPR than the CCRB.