Study Of Relationship Between The Incidence Of Acute Cerebrovascular Disease And Climatic Factors In Changzhi Area

Objective:The study is conducted to provide a strong theoretical basis of the effective prevention of acute cerebrovascular diseases to susceptible and high-incidence people by studying the relationship between the incidence of acute cerebrovascular disease and climaticfactors in Changzhi area.Methods:we collected the information of acute cerebrovascular disease incidence and meteorological data over the same period (including the maximum temperature, minimum temperature, average temperature, high atmospheric pressure, low atmospheric pressure, average pressure and relative humidity) in Changzhi area from January 2007 to December 2008. We divided the patients into two groups, cerebral infarction group and cerebral hemorrhage group and then respectively counted the daily incidence of each group. Afterwards we analyzed the relationship of daily incidences and the daily climatic factors. The differences were tested by one-way ANOVA test.Results:The incidence of acute cerebral infarction is positively correlated with the average atmospheric pressure,but when the average temperature is between minus four centigrade and minus twelve centigrade, the correlation is negative, P<0.01. When the average daily pressure is below 901hPa, the incidence of cerebral hemorrhage falls with the increasing of the atmospheric pressure. When the average pressure is above 904hPa, the incidence rises with the increasing of pressure, P> 0.05. Cerebral hemorrhage has a negative correlation with the average temperature, P> 0.05. The incidence of cerebral infarction and cerebral hemorrhage has nothing to do with the changing of atmospheric pressures and temperature in one day. When the relative humidity is above 86%, there is an upward trend of the incidence of cerebral hemorrhage as relative humidity increases, P> 0.05. When relative humidity is above 62%, the incidence of cerebral infarction increases as relative humidity increasing, P> 0.05. The incidence of cerebral infarction was slightly higher in summer, as the incidence of cerebral hemorrhage is slightly higher in spring.Conclusion:There are seasonal differences in incidence of acute cerebrovascular disease in Changzhi area; Summer is the peak period of cerebral infarction. The incidence of cerebral hemorrhage is high in spring. The incidence of acute cerebral infarction is closely related to high atmospheric pressure and low temperature. The incidence of cerebral hemorrhage may be to related with high atmospheric pressure, low atmospheric pressure and low temperatures.The relative humidity may be a relative risk factor in incidence of acute cerebrovascular diseasein a certain extent in Changzhi area. The incidences of acute cerebrovascular disease have nothing to do with the changing of atmospheric pressure and temperature in twenty-four hours.