Observational analysiS of out-of-hospital Cardiac Arrest occurRence and temporal variability patterns in subpopulation of southern POLand from 2006 to 2018: OSCAR-POL registry

Background: Temporal variability of out-of-hospital cardiac arrest (OHCA) occurrence was presented in previous studies, however, the data regarding long-term observation is scarce. The aim this study to investigate temporal OHCA during long-time period and analyze circadian pattern within particular timeframes. Methods: retrospective analysis 5058 cases made covering from January 1 st , 2006 December 31 2018. Circadian, weekly, monthly seasonal variabilities were investigated. assessed years, seasons days week. Results: highest incidence observed between 08:00 08:59 lowest 01:00 01:59 (7.1% vs. 1.6%, p < 0.001). After division into 6-h intervals, a significantly lower number occurred 00:00 05:59 (12.3%) comparison 06:00 11:59 (12.3 33.5%, on Monday (14.9%), no weekly found (p = 0.557). winter summer (27.4% 22.8%, Significant for every day week, season year Conclusions: confirmed with differences year, years.