Yamashita A, et al. - Temporal variations in dispatcher-assisted and bystander-initiated resuscitation efforts after bystander-witnessed out-of-hospital cardiac arrests (OHCAs) were investigated. Researchers also determined the association of these variations with survival. They noted that during night-time, dispatcher-assisted and bystander-initiated resuscitation efforts were low in OHCAs witnessed by non-family. For improving the outcomes of night-time OHCAs witnessed by non-family bystanders, a divisional alert system to recruit well-trained individuals seemed required.