Seasonal and temporal variations of the cerebral infarction.

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  • 脳梗塞発症と季節・時刻・病型との関連について

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Abstract

We investigated seasonal and temporal variation in the incidence of cerebral infarction for 577 serial patients admitted between January 1993 and December 1997. Based on the clinical findings, the cerebral infarction was classified into lacunar infarction (n=333), atherothrombotic infarction (n=145), cardioembolic infarction (n=99). We interviewed the time and season of stroke onset, and classified the stroke onset time into 4 groups ; at midnight and early morning (0-6h), in the morning (6-12 h), in the daytime (12-18 h), at night (18-24 h). For cerebral infarction, summer and winter were the two peak seasons ; and in the daytime was the peak time. For lacunar infarction, summer and winter were peak seasons, and in the daytime was the peak time. There were no significant seasonal and temporal variations in atherothrombotic infarction. For cardioembolic infarction, winter was the peak season and in the daytime was the peak time. Then we studied relation with cerebral infarction and age, sex, hematocrit, hypertension. There were several relations with seasonal and temporal variations of the cerebral infarction, such as older patients (over 65 years), male, high hematocrit (over 45%), hypertensive patients.

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