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© 2024 Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/ This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See:  http://creativecommons.org/licenses/by-nc/4.0/ . Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Objectives

To assess the association between ambient temperature and diurnal temperature range (DTR) on emergency admissions for hyperventilation syndrome (HVS).

Design

Distributed lag non-linear model design was used with a lag time to 5 days.

Setting

Emergency admission data used were from the Beijing Red Cross Emergency Centre (2017–2018).

Participants and exposure

Cases were those with emergency visits to the Beijing Emergency Center during the period 2017–2018 and who were given the primary outcome indicator defined as HVS according to the International Classification of Diseases, 10th edition code F45.303. Ambient temperature and DTR were used as exposure factors with adjustments for relative humidity, wind speed, precipitation, seasonality long-term trend and day of the week.

Main outcome measure

We used the minimum emergency visits temperature as a reference to indicate the relative risk with 95% CI of exposure–response for the risk of HVS visits at different temperatures.

Results

A u-shape was described between ambient temperature and HVS visits, with a minimum risk at 12°C. Moderate heat (23°C) at lag (0–3) days, extreme heat at lag 0 days, had greatest relative risks on HVS visits, with 2.021 (95% CI 1.101 to 3.71) and 1.995 (95% CI 1.016 to 3.915), respectively. A stronger association between HVS visits and temperature was found in women and aged ≤44 years. Notably, the relationship between DTR and HVS visits appeared a reverse u-shaped. Low DTR (4°C) effect appeared at lag (0–1) days with 0.589 (95% CI 0.395 to 0.878), lasting until lag (0–3) days with 0.535 (95% CI 0.319 to 0.897) and was associated with a reduced risk of HVS visits in women and those aged ≤44 years.

Conclusions

Ambient temperature and DTR were associated with HVS visits, appearing a differentiation in gender and age groups. Timely prevention strategies during high temperatures and control mild changes in temperature might reduce the risk of HVS.

Details

Title
Impact of ambient temperature, diurnal temperature range on hyperventilation syndrome emergency admission: a time-series analysis in Beijing, China
Author
Wang, Jianping 1 ; Zhang, Yongming 2 ; Liu, Xuan 1 ; Li, Xuan 1 ; Zhao, Qi 3 ; Zhao, Jinhua 1 ; Ni, Ying 1 ; Guo, Yuming 4 ; Zhuang Cui 1 ; Zhang, Wenyi 5 ; Li, Changping 1   VIAFID ORCID Logo 

 School of Public Health, Tianjin Medical University, Heping, Tianjin, China 
 Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, National Clinical Research Center for Respiratory Diseases, Beijing, China 
 Department of Epidemiology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, China; Shandong University Climate Change and Health Center, Jinan, China 
 Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia 
 Chinese PLA Center for Disease Control and Prevention, Beijing, China 
First page
e080318
Section
Public health
Publication year
2024
Publication date
2024
Publisher
BMJ Publishing Group LTD
e-ISSN
20446055
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2930062385
Copyright
© 2024 Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/ This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See:  http://creativecommons.org/licenses/by-nc/4.0/ . Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.