Temperature and Age-gender Effects on Out-of- hospital Cardiac Arrest Cases

Chien Tat LOW, Poh Chin LAI, Paul YEUNG, Axel SIU, Kelvin LEUNG, Pui Yun WONG

Research output: Journal PublicationsJournal Article (refereed)Researchpeer-review

Abstract

Introduction: Temperature is a key factor influencing the occurrence of out-of-hospital cardiac arrest, yet there is no equivalent study in Hong Kong. This study reports results involving a large-scale territory-wide investigation on the impacts of ambient temperature and age–gender differences on out-of-hospital cardiac arrest outcome in Hong Kong. Methods: This study included 25,467 out-of-hospital cardiac arrest cases treated by the Hong Kong Fire Services Department between December 2011 and November 2016 inclusive. Simple correlation and regression analyses were used to examine the relationships between out-of-hospital cardiac arrest cases and temperature, age and gender. Calendar charts were used to visualise temporal patterns of pre-hospital emergency medical services related to out-of-hospital cardiac arrest cases. Results: A strong negative curvilinear relationship was found between out-of-hospital cardiac arrest and daily temperature (r 2 > 0.9) with prominent effects on elderly people aged ≥85 years. For each unit decrease in mean temperature in °C, there was a maximum of 5.6% increase in out-of-hospital cardiac arrest cases among all age groups and 7.3% increase in the ≥85 years elderly age group. Men were slightly more at risk of out-of-hospital cardiac arrest compared with women. The demand for out-of-hospital cardiac arrest–related emergency medical services was highest between 06:00 and 11:00 in the wintertime. Conclusion: This study provides the first local evidence linking weather and demographic effects with out-of-hospital cardiac arrest in Hong Kong. It offers empirical evidence to policymakers in support of strengthening existing emergency medical services to deal with the expected increase in out-of-hospital cardiac arrest in the wintertime and in regions with a large number of elderly population.

Original languageEnglish
Pages (from-to)83-90
Number of pages8
JournalHong Kong Journal of Emergency Medicine
Volume25
Issue number2
DOIs
Publication statusPublished - 5 Jan 2018

Fingerprint

Out-of-Hospital Cardiac Arrest
Temperature
Hong Kong
Emergency Medical Services
Age Groups
Weather
Hospital Emergency Service
Regression Analysis
Demography

Keywords

  • Emergency medical services
  • Out-of-hospital cardiac arrest
  • Temperature

Cite this

LOW, Chien Tat ; LAI, Poh Chin ; YEUNG, Paul ; SIU, Axel ; LEUNG, Kelvin ; WONG, Pui Yun. / Temperature and Age-gender Effects on Out-of- hospital Cardiac Arrest Cases. In: Hong Kong Journal of Emergency Medicine. 2018 ; Vol. 25, No. 2. pp. 83-90.
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title = "Temperature and Age-gender Effects on Out-of- hospital Cardiac Arrest Cases",
abstract = "Introduction: Temperature is a key factor influencing the occurrence of out-of-hospital cardiac arrest, yet there is no equivalent study in Hong Kong. This study reports results involving a large-scale territory-wide investigation on the impacts of ambient temperature and age–gender differences on out-of-hospital cardiac arrest outcome in Hong Kong. Methods: This study included 25,467 out-of-hospital cardiac arrest cases treated by the Hong Kong Fire Services Department between December 2011 and November 2016 inclusive. Simple correlation and regression analyses were used to examine the relationships between out-of-hospital cardiac arrest cases and temperature, age and gender. Calendar charts were used to visualise temporal patterns of pre-hospital emergency medical services related to out-of-hospital cardiac arrest cases. Results: A strong negative curvilinear relationship was found between out-of-hospital cardiac arrest and daily temperature (r 2 > 0.9) with prominent effects on elderly people aged ≥85 years. For each unit decrease in mean temperature in °C, there was a maximum of 5.6{\%} increase in out-of-hospital cardiac arrest cases among all age groups and 7.3{\%} increase in the ≥85 years elderly age group. Men were slightly more at risk of out-of-hospital cardiac arrest compared with women. The demand for out-of-hospital cardiac arrest–related emergency medical services was highest between 06:00 and 11:00 in the wintertime. Conclusion: This study provides the first local evidence linking weather and demographic effects with out-of-hospital cardiac arrest in Hong Kong. It offers empirical evidence to policymakers in support of strengthening existing emergency medical services to deal with the expected increase in out-of-hospital cardiac arrest in the wintertime and in regions with a large number of elderly population.",
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Temperature and Age-gender Effects on Out-of- hospital Cardiac Arrest Cases. / LOW, Chien Tat; LAI, Poh Chin; YEUNG, Paul; SIU, Axel; LEUNG, Kelvin; WONG, Pui Yun.

In: Hong Kong Journal of Emergency Medicine, Vol. 25, No. 2, 05.01.2018, p. 83-90.

Research output: Journal PublicationsJournal Article (refereed)Researchpeer-review

TY - JOUR

T1 - Temperature and Age-gender Effects on Out-of- hospital Cardiac Arrest Cases

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AU - LAI, Poh Chin

AU - YEUNG, Paul

AU - SIU, Axel

AU - LEUNG, Kelvin

AU - WONG, Pui Yun

PY - 2018/1/5

Y1 - 2018/1/5

N2 - Introduction: Temperature is a key factor influencing the occurrence of out-of-hospital cardiac arrest, yet there is no equivalent study in Hong Kong. This study reports results involving a large-scale territory-wide investigation on the impacts of ambient temperature and age–gender differences on out-of-hospital cardiac arrest outcome in Hong Kong. Methods: This study included 25,467 out-of-hospital cardiac arrest cases treated by the Hong Kong Fire Services Department between December 2011 and November 2016 inclusive. Simple correlation and regression analyses were used to examine the relationships between out-of-hospital cardiac arrest cases and temperature, age and gender. Calendar charts were used to visualise temporal patterns of pre-hospital emergency medical services related to out-of-hospital cardiac arrest cases. Results: A strong negative curvilinear relationship was found between out-of-hospital cardiac arrest and daily temperature (r 2 > 0.9) with prominent effects on elderly people aged ≥85 years. For each unit decrease in mean temperature in °C, there was a maximum of 5.6% increase in out-of-hospital cardiac arrest cases among all age groups and 7.3% increase in the ≥85 years elderly age group. Men were slightly more at risk of out-of-hospital cardiac arrest compared with women. The demand for out-of-hospital cardiac arrest–related emergency medical services was highest between 06:00 and 11:00 in the wintertime. Conclusion: This study provides the first local evidence linking weather and demographic effects with out-of-hospital cardiac arrest in Hong Kong. It offers empirical evidence to policymakers in support of strengthening existing emergency medical services to deal with the expected increase in out-of-hospital cardiac arrest in the wintertime and in regions with a large number of elderly population.

AB - Introduction: Temperature is a key factor influencing the occurrence of out-of-hospital cardiac arrest, yet there is no equivalent study in Hong Kong. This study reports results involving a large-scale territory-wide investigation on the impacts of ambient temperature and age–gender differences on out-of-hospital cardiac arrest outcome in Hong Kong. Methods: This study included 25,467 out-of-hospital cardiac arrest cases treated by the Hong Kong Fire Services Department between December 2011 and November 2016 inclusive. Simple correlation and regression analyses were used to examine the relationships between out-of-hospital cardiac arrest cases and temperature, age and gender. Calendar charts were used to visualise temporal patterns of pre-hospital emergency medical services related to out-of-hospital cardiac arrest cases. Results: A strong negative curvilinear relationship was found between out-of-hospital cardiac arrest and daily temperature (r 2 > 0.9) with prominent effects on elderly people aged ≥85 years. For each unit decrease in mean temperature in °C, there was a maximum of 5.6% increase in out-of-hospital cardiac arrest cases among all age groups and 7.3% increase in the ≥85 years elderly age group. Men were slightly more at risk of out-of-hospital cardiac arrest compared with women. The demand for out-of-hospital cardiac arrest–related emergency medical services was highest between 06:00 and 11:00 in the wintertime. Conclusion: This study provides the first local evidence linking weather and demographic effects with out-of-hospital cardiac arrest in Hong Kong. It offers empirical evidence to policymakers in support of strengthening existing emergency medical services to deal with the expected increase in out-of-hospital cardiac arrest in the wintertime and in regions with a large number of elderly population.

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JF - Hong Kong Journal of Emergency Medicine

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