Key result
The occurrence of out-of-hospital cardiac arrest exhibited a pronounced morning peak on Saturday to Monday that was absent during mid-week days.
Why the study?
Previous studies showed differing OHCA incidence across days of the week, prompting comparison of diurnal variability between days with the highest versus lowest incidence.
Does the circadian variability of out-of-hospital cardiac arrest differ between days of the week with highest (Saturday-Monday) versus lowest (Tuesday-Friday) incidence?
Observational (n=815)
No
Does the circadian variability of out-of-hospital cardiac arrest differ between days of the week with highest (Saturday-Monday) versus lowest (Tuesday-Friday) incidence?
The occurrence of out-of-hospital cardiac arrest exhibits a pronounced morning peak on Saturday to Monday that is absent during mid-week days.
Answers are grounded in this paper and cite their sources.
OHCA shows weekday-specific circadian patterns; hypothesis-generating for targeted prevention, prospective studies needed before practice implications.
Introduction Previous studies showed a significant difference in out-of-hospital cardiac arrest (OHCA) occurrence between days of the week, with its highest incidence from Saturday to Monday and lowest in the middle of the week (Tuesday to Friday). The aim of this study was to compare the diurnal variability of the occurrence of OHCA on the days with the highest and lowest incidence of the latter. Methods Retrospective analysis of 815 OHCA cases with presumed cardiac etiology in Opole (Poland), covering a 2-year period (2006-2007). Statistical evaluation of the circadian patterns of OHCA occurrence on days with the highest and the lowest OHCA prevalence. Results Circadian variability of OHCA incidence, assessed by comparing consecutive 3-hour intervals, was present on Saturday to Monday (p=0.04), but absent on Tuesday to Friday (p=0.08). Both analyzed periods differed in terms of the morning (09:00-11:00) peak of OHCA occurrence, which was clearly seen on Saturday-Monday, but absent in the mid-week (median 8.0 [7.0-10.0] vs 5.0 [5.0-6.5], p=0.03). Conclusions The occurrence of OHCA follows different patterns on Saturday to Monday versus the mid-week days, with a pronounced morning peak only on Saturday to Monday.
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Stanisław Szczerbiński (2020) conducted an observational in Out-of-hospital cardiac arrest (n=815). Saturday to Monday vs. Tuesday to Friday was evaluated on Morning peak (09:00-11:59) of OHCA occurrence (median number of cases) (p=0.03). The occurrence of out-of-hospital cardiac arrest exhibited a pronounced morning peak on Saturday to Monday that was absent during mid-week days.
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