Key result
Summer is linked to fewer hemorrhagic strokes, while ischemic stroke seasonality depends on regional climate.
Why the study?
The dependence of strokes on various meteorological factors and regional climate characteristics remains unclear despite known seasonal variation in cardiovascular events.
Do seasonal fluctuations in meteorological factors affect the incidence of hospitalizations for hemorrhagic and ischemic strokes?
Meta-Analysis
Do seasonal fluctuations in meteorological factors affect the incidence of hospitalizations for hemorrhagic and ischemic strokes?
Hemorrhagic stroke incidence is consistently lower in summer across climates, while ischemic stroke seasonality is highly dependent on regional meteorological factors like atmospheric pressure.
Answers are grounded in this paper and cite their sources.
May inform seasonal prevention planning for hemorrhagic stroke; leaves open causal climate mechanisms for ischemic events.
Background Cardiovascular events occur more often in winter than in summer; however, the dependence of strokes on various meteorological factors remains unclear. Aims The purpose of this meta-analysis was to determine the dependence of the circannual dynamics of hospitalizations for hemorrhagic stroke and ischemic stroke on seasonal fluctuations in meteorological factors. Summary of review and conclusions For our meta-analysis, we selected 20 and 26 publications examining the seasonal dynamics of hemorrhagic stroke and ischemic stroke, respectively . The meta-analysis showed that hemorrhagic stroke is less likely to occur in summer than in other seasons and does not depend on a region’s climate. The seasonal dynamics of ischemic stroke are not clearly expressed and are determined by the characteristics of a region’s climate. In a climate without pronounced seasonal dynamics of atmospheric pressure and in wet winters, the vector of ischemic stroke incidents will not be expressed or slightly shifted toward winter. Low atmospheric pressure in summer is associated with an increased likelihood of ischemic stroke during this season compared to winter. There was also a relation between ischemic stroke risk with high relative humidity and a significant decrease in ρO 2 in summer, but there is not enough evidence regarding this association. We did not reveal dependence of the seasonal dynamics of strokes on the amplitude of annual fluctuations in air temperature.
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Kuzmenko et al. (2021) conducted a meta-analysis in Hemorrhagic and ischemic strokes. Seasonal fluctuations in meteorological factors vs. Other seasons was evaluated on Circannual dynamics of hospitalizations for hemorrhagic stroke and ischemic stroke. Hemorrhagic stroke is less likely to occur in summer than other seasons, while ischemic stroke seasonality depends on regional climate characteristics such as atmospheric pressure and humidity.
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