脳動脈瘤破裂時の気候，気象および患者の行動

THE RELATIONSHIP BETWEEN THE RUPTURING OF INTRACRANIAL ANEURYSM AND SEASON, WEATHER AND PATIENT'S ACTIVITY

I．はじめに

　脳血管性障害の発症に関与する因子として従来季節^1,4,11,14），気象^1,11），運動^6,8），精神的緊張^8,15）等多くのものがあげられている。しかし脳血管性障害の中でもその具体的な病型に関する検討は少なく，まして脳動脈瘤に関しては皆無に等しい。さらにまた先人達の研究は主に脳血管性障害死を対象としたものであり，罹患についての検索はほとんど行なわれていない。そこで著者らは脳動脈瘤直接手術により破裂脳動脈瘤と確認した症例を対象に脳動脈瘤破裂（初回発作）に及ぼす諸因子に関し検討し，若干の文献的考察を加え報告する。

Some physical and mental stresses have been noticed as the exciting factors for the occurrence of cerebrovascular diseases. However, little has been known about them of ruptured intracranial aneurysms. From this point of view, the correlation between the several physical strains and the oc-currence of ruptured intracranial aneurysm were studied in this report. This study was based on 920 cases of ruptured intracranial saccular aneurysm which were verified by direct aneurysmal surgery.

As for the season, the occurrence of ruptured intracranial aneurysms was apt to be frequent in winter and infrequent in summer.

No relation between the onsets and the meteor-ological fronts could be found.

The incidence during sleep was about 6%. This incidence was thought to be rather lower con-sidering the fact that one-third of our lives is spent in sleep. Lifting and bending, defecation and/or urination and emotional strain were among the commonest environmental events associated with the onset.

Based on these results, weather or season, which is mild physical stress, can in no way be considered a great cause of rupturing of intracranial aneurysm, but it should seem that patient's activities or events have some influences in rupturing of aneurysm to a great extent.