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Abstract Title:

Geomagnetic storms can trigger stroke: evidence from 6 large population-based studies in Europe and Australasia.

Abstract Source:

Stroke. 2014 Jun ;45(6):1639-45. Epub 2014 Apr 22. PMID: 24757102

Abstract Author(s):

Valery L Feigin, Priya G Parmar, Suzanne Barker-Collo, Derrick A Bennett, Craig S Anderson, Amanda G Thrift, Birgitta Stegmayr, Peter M Rothwell, Maurice Giroud, Yannick Bejot, Phillip Carvil, Rita Krishnamurthi, Nikola Kasabov,

Article Affiliation:

Valery L Feigin

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.

Study Type : Human Study

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Sayer Ji
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