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Daylight savings time transitions and risk of out-of-hospital cardiac arrest: An interrupted time series analysis.
Resuscitation. 2021 11; 168:84-90.R

Abstract

BACKGROUND

Many studies have reported increases in the risk of acute cardiovascular events following daylight savings time (DST) transitions. We sought to investigate the effect of DST transition on the incidence of out-of-hospital cardiac arrest (OHCA).

METHODS

Between January 2000 and December 2020, we performed an interrupted time series analysis of the daily number of OHCA cases of medical aetiology from the Victorian Ambulance Cardiac Arrest Registry. The effect of DST transition on OHCA incidence was estimated using negative binomial models, adjusted for temporal trends, population growth, and public holidays.

RESULTS

A total of 89,409 adult OHCA of medical aetiology were included. Following the spring DST transition (i.e. shorter day), there was an immediate 13% (IRR 1.13, 95% CI: 1.02, 1.25; p = 0.02) increased risk of OHCA on the day of transition (Sunday) and the cumulative risk of OHCA remained higher over the first 2 days (IRR 1.17, 95% CI: 1.02, 1.34; p = 0.03) compared to non-transitional days. Following the autumn DST transition (i.e. longer day), there was a significant lagged effect on the Tuesday with a 12% (IRR 0.88, 95% CI: 0.77, 0.99; p = 0.04) reduced risk of OHCA. The cumulative effect following the autumn DST transition was also significant, with a 30% (IRR 0.70, 95% CI: 0.51, 0.96; p = 0.03) reduction in the incidence of OHCA by the end of the transitional week.

CONCLUSION

We observed both harmful and protective effects from DST transitions on the risk of OHCA. Strategies to reduce this risk in vulnerable populations should be considered.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Hook J
Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia.
Smith K
Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia.
Andrew E
Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia.
Ball J
Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia; Pre-Clinical Disease and Prevention, Baker Heart & Diabetes Institute, Melbourne, Victoria, Australia.
Nehme Z
Centre for Research and Evaluation, Ambulance Victoria, Blackburn North, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Prahran, Victoria, Australia. Electronic address: ziad.nehme@ambulance.vic.gov.au.

MeSH

AdultAmbulancesHumansIncidenceInterrupted Time Series AnalysisOut-of-Hospital Cardiac ArrestRegistries

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

34571135

Citation

Hook, Jack, et al. "Daylight Savings Time Transitions and Risk of Out-of-hospital Cardiac Arrest: an Interrupted Time Series Analysis." Resuscitation, vol. 168, 2021, pp. 84-90.
Hook J, Smith K, Andrew E, et al. Daylight savings time transitions and risk of out-of-hospital cardiac arrest: An interrupted time series analysis. Resuscitation. 2021;168:84-90.
Hook, J., Smith, K., Andrew, E., Ball, J., & Nehme, Z. (2021). Daylight savings time transitions and risk of out-of-hospital cardiac arrest: An interrupted time series analysis. Resuscitation, 168, 84-90. https://doi.org/10.1016/j.resuscitation.2021.09.021
Hook J, et al. Daylight Savings Time Transitions and Risk of Out-of-hospital Cardiac Arrest: an Interrupted Time Series Analysis. Resuscitation. 2021;168:84-90. PubMed PMID: 34571135.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Daylight savings time transitions and risk of out-of-hospital cardiac arrest: An interrupted time series analysis. AU - Hook,Jack, AU - Smith,Karen, AU - Andrew,Emily, AU - Ball,Jocasta, AU - Nehme,Ziad, Y1 - 2021/09/24/ PY - 2021/07/05/received PY - 2021/09/15/revised PY - 2021/09/19/accepted PY - 2021/9/28/pubmed PY - 2021/11/3/medline PY - 2021/9/27/entrez KW - Cardiac arrest KW - Chronobiology KW - Circadian rhythm KW - Daylight savings time KW - Emergency medical services SP - 84 EP - 90 JF - Resuscitation JO - Resuscitation VL - 168 N2 - BACKGROUND: Many studies have reported increases in the risk of acute cardiovascular events following daylight savings time (DST) transitions. We sought to investigate the effect of DST transition on the incidence of out-of-hospital cardiac arrest (OHCA). METHODS: Between January 2000 and December 2020, we performed an interrupted time series analysis of the daily number of OHCA cases of medical aetiology from the Victorian Ambulance Cardiac Arrest Registry. The effect of DST transition on OHCA incidence was estimated using negative binomial models, adjusted for temporal trends, population growth, and public holidays. RESULTS: A total of 89,409 adult OHCA of medical aetiology were included. Following the spring DST transition (i.e. shorter day), there was an immediate 13% (IRR 1.13, 95% CI: 1.02, 1.25; p = 0.02) increased risk of OHCA on the day of transition (Sunday) and the cumulative risk of OHCA remained higher over the first 2 days (IRR 1.17, 95% CI: 1.02, 1.34; p = 0.03) compared to non-transitional days. Following the autumn DST transition (i.e. longer day), there was a significant lagged effect on the Tuesday with a 12% (IRR 0.88, 95% CI: 0.77, 0.99; p = 0.04) reduced risk of OHCA. The cumulative effect following the autumn DST transition was also significant, with a 30% (IRR 0.70, 95% CI: 0.51, 0.96; p = 0.03) reduction in the incidence of OHCA by the end of the transitional week. CONCLUSION: We observed both harmful and protective effects from DST transitions on the risk of OHCA. Strategies to reduce this risk in vulnerable populations should be considered. SN - 1873-1570 UR - https://www.unboundmedicine.com/medline/citation/34571135/Daylight_savings_time_transitions_and_risk_of_out_of_hospital_cardiac_arrest:_An_interrupted_time_series_analysis_ DB - PRIME DP - Unbound Medicine ER -