Ambient Temperature and Stroke Occurrence: A Systematic Review and Meta-Analysis

Overview

Journal Int J Environ Res Public Health

Publisher MDPI

Specialties Environmental Health
Public Health

Date 2016 Jul 16

PMID 27420077

Citations 31

Authors

Xia Wang

Yongjun Cao

Daqing Hong

Danni Zheng

Sarah Richtering

Else Charlotte Sandset

Tzen Hugh Leong

Hisatomi Arima

Shariful Islam

Abdul Salam

Craig Anderson

Thompson Robinson

Maree L Hackett

Affiliations

Soon will be listed here.

Abstract

Biologically plausible associations exist between climatic conditions and stroke risk, but study results are inconsistent. We aimed to summarize current evidence on ambient temperature and overall stroke occurrence, and by age, sex, and variation of temperature. We performed a systematic literature search across MEDLINE, Embase, PsycINFO, CINAHL, Web of Science, and GEOBASE, from inception to 16 October 2015 to identify all population-based observational studies. Where possible, data were pooled for meta-analysis with Odds ratios (OR) and corresponding 95% confidence intervals (CI) by means of the random effects meta-analysis. We included 21 studies with a total of 476,511 patients. The data were varied as indicated by significant heterogeneity across studies for both ischemic stroke (IS) and intracerebral hemorrhage (ICH). Pooled OR (95% CI) in every 1 degree Celsius increase in ambient temperature was significant for ICH 0.97 (0.94-1.00), but not for IS 1.00 (0.99-1.01) and subarachnoid hemorrhage (SAH) 1.00 (0.98-1.01). Meta-analysis was not possible for the pre-specified subgroup analyses by age, sex, and variation of temperature. Change in temperature over the previous 24 h appeared to be more important than absolute temperature in relation to the risk of stroke, especially in relation to the risk of ICH. Older age appeared to increase vulnerability to low temperature for both IS and ICH. To conclude, this review shows that lower mean ambient temperature is significantly associated with the risk of ICH, but not with IS and SAH. Larger temperature changes were associated with higher stroke rates in the elderly.

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