| pubmed-article:152042 | pubmed:abstractText | A study of the frequency of strokes in different periodical intervals during 22 years according to the data of Urgent Medical Aid Stations in Leningrad demonstrated a certain influence of environmental physical factors on the incidence rate. Certain intraannual fluctuations with a maximum increase in the winter-spring period and a drop of the incidence during summer were due to the weather influence and sun activity. The most biotropic were fluctuations of atmospheric pressure, especially its drop and sun (magnetic) perturbation. The different seasonal influence of separate physical factors are not the same. During winter there is a prevalence of biotropical significance in the fluctuation of barometrical pressure, in spring--geomagnetical perturbations. | lld:pubmed |
