Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Heat, Heatwaves and Cardiorespiratory Hospital Admissions in Helsinki, Finland

Version 1 : Received: 22 September 2020 / Approved: 23 September 2020 / Online: 23 September 2020 (10:32:12 CEST)

How to cite: Sohail, H.B.; Tiittanen, P.; Kollanus, V.; Schneider, A.; Lanki, T. Heat, Heatwaves and Cardiorespiratory Hospital Admissions in Helsinki, Finland. Preprints 2020, 2020090550 (doi: 10.20944/preprints202009.0550.v1). Sohail, H.B.; Tiittanen, P.; Kollanus, V.; Schneider, A.; Lanki, T. Heat, Heatwaves and Cardiorespiratory Hospital Admissions in Helsinki, Finland. Preprints 2020, 2020090550 (doi: 10.20944/preprints202009.0550.v1).

Abstract

There is a lack of knowledge concerning the effects of ambient heat exposure on morbidity in Northern Europe. Therefore, this study aimed to evaluate the relationships of daily summer-time temperature and heatwaves with cardiorespiratory hospital admissions in the Helsinki metropolitan area, Finland. Methods: Time-series models adjusted for potential confounders such as air pollution were used to investigate the associations of daily temperature and heatwaves with cause-specific cardiorespiratory hospital admissions, during summer months of 2001-2017. Daily number of hospitalizations was obtained from the national hospital discharge register, weather information from the Finnish Meteorological Institute. Results: Increased daily temperature was associated with decreased risk of total respiratory hospital admissions and asthma. Heatwave days were associated with 20.5% (95% CI: 6.9, 35.9) increased risk of pneumonia admissions and during long or intense heatwaves also with total respiratory admissions in the oldest age group (≥ 75 years). There were also suggestive positive associations between heatwave days and admissions due to myocardial infarction and cerebrovascular diseases. In contrast, risk of arrhythmia admissions was decreased 20.8% (95% CI: 8.0, 31.8) during heatwaves. Conclusions: Heatwaves, rather than single hot days, are a health threat affecting the morbidity even in a Northern climate.

Subject Areas

Heat; Heatwave; Cardiovascular diseases; Respiratory diseases; Hospital admissions; Climate change; ambient temperature; Public health; time series; summer months

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