Okubo M, Chan HK, Callaway CW, et al. - Using the 2016 National Emergency Medical Services Information System (NEMSIS) dataset, a national registry of emergency medical services (EMS) activations at 46 states in the United States (US), researchers performed a cross-sectional study to examine the national characteristics of paediatric out-of-hospital cardiac arrest (OHCA). They involved paediatric patients (age <18 years) with “9-1-1” EMS responses to OHCA. Among 1,531,469 paediatric EMS responses, the authors reported a total of 23,514 EMS responses to paediatric OHCA, incidence of 15.4 per 1,000 paediatric EMS responses, and estimated national incidence of 37.9 per 100,000 child-years. Among 23,514 EMS responses to paediatric OHCA, they found 4,515 of EMS responses in infants, 5,588 in young children, 4,976 in older children, and 8,435 in adolescents. They estimate that there are over 23,000 annual paediatric OHCA in the US using data from the NEMSIS. Such information provide key insights of paediatric OHCA in the US.