1987 Volume 9 Issue 6 Pages 473-480
Based on the data from the patients with acute stroke who were admitted to the Research Institute for Brain and Blood Vessels between 1969 and 1986, changes in stroke incidence were analyzed from the clinicoepidemiological point of view.
1. In all three types of stroke; cerebral infarction, cerebral hemorrhage and subarachnoid hemorrhage, the mean age of onset became older by approximately 4 years in these 18 years. There was a tendency for male to develop stroke 3.5 years earlier on average as compared with female.
2. The incidence of cerebral infarction has been increasing whereas those of cerebral hemorrhage and subarachnoid hemorrhage have been declining.
3. In all three type of stroke, the mortality rate whithin a month of onset has been declining, and there was, in general, a trend that the severity of stroke has been lessened in recent years.
In addition, the results from the Stroke Registration System which was conduced by the Group of Clinicoepidemiological Study in Akita was discussed in relation to the changes in stroke incidence.
