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The results obtained concern the dependence of acute brain blood circulation pathology (ABBCP) frequency on several meteorological factors: wind speed, barometrical pressure, interdaily barometrical pressure changes, relative air humidity, air temperature, interdaily air temperature changes, oxygen content in air and interdaily oxygen content variability in the air. The mean daily number of patients was taken into account. 4023 ABBCP observations were analyzed. Wind, relative air humidity and interdaily changes of oxygen content in air were determined to influence greatly the ABBCP frequency under conditions of Middle Russia Hills region. Meteorological factors enumerated are supposed to be used in further multifactorial statistical analyses for comprehensive estimation of weather elements as well as for scientifically based prognoses of the ABBCP number and carrying out the preventive measures.

An analysis of 4023 cases of acute cerebral circulatory impairments (ACCI) recorded in the cities of the Central Russia plateau (Kursk, Belgorod, Orel, Zheleznogorsk) has shown that there is an increase in the incidence of ACCI both upon the onset and the cessation of magnetic storms. An elevated rate of ACCI was observed both at high and low levels of the regional magnetic field tension. Therefore, the authors suggest that while making a regression-correlation analysis by the gradient of the Earth's magnetic field--differential regional K-index, the sign of tension alterations should be left out of account. This makes it possible to elucidate the linear dependence between the ACCI incidence and the differential K-index. Results of analysis are proposed to be used in multivariate statistical investigations with the purpose of medical weather forecasting and the prevention of cardiovascular disease complications.