Abstract
The aim of this study was to examine the relationship between weather conditions and the occurrence of subarachnoid hemorrhage. From 2000 to 2006, 1191 subarachnoid hemorrhage patients were admitted to the Juntendo Hospital or its 6 affiliated hospitals. In addition, weather data were obtained from the Country Environmental Laboratory of IDEA Co., Ltd. Results: (1) The subjects included 421 males, whose average age was 62.1±11.8 (average±SD) and 720 females, whose average age was 68.0±13.6 (average±SD). (2) Among 776 patients recorded at set times, the most were observed at 06:00–10:00, the next at 16:00–20:00, and few at 0:00–06:00. (3) In addition, as for this seasonal variation, young patients were clearer than the senior patients. (4) When the daily mean air temperature on the day before the occurrence was low, the tendency of the occurrence of the disease was high (P<0.05). (5) The occurrence of the disease showed no significant relation with age or history of hypertension, and a positively significant relation with daily temperature change (P<0.05). (6) The occurrence of subarachnoid hemorrhage did not show significant relation with the average atmospheric pressure, relative humidity or daylight hours of the day before the occurrence.
