Geomagnetic Storms Can Trigger Stroke

Author:

Feigin Valery L.1,Parmar Priya G.1,Barker-Collo Suzanne1,Bennett Derrick A.1,Anderson Craig S.1,Thrift Amanda G.1,Stegmayr Birgitta1,Rothwell Peter M.1,Giroud Maurice1,Bejot Yannick1,Carvil Phillip1,Krishnamurthi Rita1,Kasabov Nikola1

Affiliation:

1. From the National Institute for Stroke and Applied Neurosciences (V.L.F., P.G.P., R.K.) and Knowledge Engineering and Discovery Research Institute (N.K.), Auckland University of Technology, Auckland, New Zealand; School of Psychology, The University of Auckland, Auckland, New Zealand (S.B.-C.); Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health (D.A.B.) and University Department of Clinical Neurology (P.M.R.), University of Oxford, Oxford, United...

Abstract

Background and Purpose— Although the research linking cardiovascular disorders to geomagnetic activity is accumulating, robust evidence for the impact of geomagnetic activity on stroke occurrence is limited and controversial. Methods— We used a time-stratified case-crossover study design to analyze individual participant and daily geomagnetic activity (as measured by Ap Index) data from several large population-based stroke incidence studies (with information on 11 453 patients with stroke collected during 16 031 764 person-years of observation) in New Zealand, Australia, United Kingdom, France, and Sweden conducted between 1981 and 2004. Hazard ratios and corresponding 95% confidence intervals (CIs) were calculated. Results— Overall, geomagnetic storms (Ap Index 60+) were associated with 19% increase in the risk of stroke occurrence (95% CI, 11%–27%). The triggering effect of geomagnetic storms was most evident across the combined group of all strokes in those aged <65 years, increasing stroke risk by >50%: moderate geomagnetic storms (60–99 Ap Index) were associated with a 27% (95% CI, 8%–48%) increased risk of stroke occurrence, strong geomagnetic storms (100–149 Ap Index) with a 52% (95% CI, 19%–92%) increased risk, and severe/extreme geomagnetic storms (Ap Index 150+) with a 52% (95% CI, 19%–94%) increased risk (test for trend, P <2×10 −16 ). Conclusions— Geomagnetic storms are associated with increased risk of stroke and should be considered along with other established risk factors. Our findings provide a framework to advance stroke prevention through future investigation of the contribution of geomagnetic factors to the risk of stroke occurrence and pathogenesis.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Advanced and Specialized Nursing,Cardiology and Cardiovascular Medicine,Neurology (clinical)

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