Study On The Effect Of Meteorological Factors On Cerebral Vascular Disease Of Qingdao Residents

Objective: To examine the effects of meteorological factors on cerebral vascular disease (CVD) of Qingdao residents .Methods: I examined onset of the stroke over a 5-year period, from 1998 to 2002 in Qingdao to find out stroke occurrence patterns. I analyzed seasonal variation in stroke occurrence with analysis of variance and yearly centralization trend of stroke occurrence with circular distribution . I identified seven months, in which changes in meteorological parameters were significant, grouped daily meteorological parameters of these months and corresponding patient data by pentad and statisticed with Pearson' s correlation and multiple regression. .Results: (1) seasonal patterns of intracerebral hemorrhage and cerebral infarction occurrence are apparent.. (2)There is a trend of centralization in yearly intracerebral hemorrhage occurrence with the mean angles in December, January and February (P<0.05 .Some yearly cerebral infarction occurrences have trends of centralization, in July, August and October (P< 0.05 (3) Pearsori s correlation analysis suggests that monthly intracerebral hemorrhage occurrence is negatively correlated with either average or extrimly temperature( p<0.05 and positively correlated with either average or extrimly barometric pressure( p<0.05 ; monthly cerebral infarction occurrence is negatively correlated with monthly average relative humidity (p=0.004) and positively correlated with either average or highest temperature and highest barometric pressure.(p < 0.05 (4) Stepwise regression analysis suggests that intracerebral hemorrhage occurrence is associated with monthly average barometric pressure, relative humidity and wind speed, and cerbral infarction occurrence is associated with either monthly average or highest temperature and barometric pressure (5) Pearsori s correlation analysis suggests that cerebral infarction occurrence of a pentad is positively correlated with average lowest temperature (p< 0.005 and negatively correlated with barometric pressure difference between current pentad and previous pentad ( p<0.05 , and intracerebral hemorrhage occurrence of a pentad is negatively correlated with average temperature difference between pentads(p< 0.05 ; multiple regression suggests that intracerebral hemorrhage occurrence iscorrelated only with average lowest temperature difference between pentads(P<0.05 Conclusions: Intracerebral hemorrhage occurrence is associated with the activity of high pressure and cold air mass. And cerebral infarction occurrence is associated with the activity of low pressure and warm air mass as well as the changes in recent barometric pressure and temperature. The interaction of multiple meteorological factors has effects on stroke occurrence.