• Yun Jeong Kim, Hyun Wook Ryoo, Sang Do Shin, Kyoung Jun Song, and Young Sun Ro.
• Laboratory of Emergency Medical Services, Seoul National University Hospital Biomedical Research Institute, Seoul, South Korea.
• Emerg Med Australas. 2017 Oct 1; 29 (5): 551-562.

ObjectiveThe present study aimed to determine whether the time of out-of-hospital cardiac arrest (OHCA) is associated with survival rate and neurological outcome after OHCA, as well as to compare the effect size of time of OHCA across six Asian regions.MethodsWe collected data from the Pan-Asian Resuscitation Outcomes Study registry, six Asian regions (Tokyo, Osaka, Aichi, Seoul, Taipei and Singapore) from 2009 to 2012. Adult OHCA cases were divided depending on the arrest time: I (00.01-06.00 hours), II (06.01-12.00 hours), III (12.01-18.00 hours) and IV (18.01-24.00 hours). Using a multivariable logistic regression analysis, we compared the outcomes of survival and good neurological recovery.ResultsOf 65 413 cases treated by the emergency medical service, 36 706 (56.1%) cases were analysed. There was the lowest OHCA incidence in time block I. Compared with time block I, the adjusted odds ratios and 95% confidence intervals for the standardised survival rate were 1.6 (1.3-1.9) in time block II, 1.4 (1.2-1.7) in time block III and 1.2 (1.0-1.4) in time block IV. Regarding the good neurological recovery rate, compared with time block I, the adjusted odds ratios and 95% confidence intervals were 1.9 (1.5-2.4) in time block II, 1.7 (1.3-2.1) in time block III and 1.4 (1.1-1.7) in time block IV. However, in the subgroup analysis, there were regional differences between Japan and the other regions.ConclusionsWe found diurnal similarities in OHCA occurrence, as well as differences in survival rate and good neurological recovery rate among Asian regions.© 2017 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.

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