抄録
The incidence of strokes among 16, 000 persons in 11 districts across the nation was registered. The frequency by type of stroke was 25% for cerebral hemorrhage, 65% for cerebral infarction and 10% for subarachnoid hemorrhage. The early-stage mortality within four weeks after the onset of strokes stood at 10-20%, whereas the mortality within one year came to 20-30%. The rate of those who require total care (in bedridden conditions) one year after the onset was in the neighborhood of 15%. The higher the age, the higher the rate.
A check of trends in the Saku district of Nagano Prefecture in the last 17 years indicates that the incidence of strokes had slightly dropped but the early-stage mortality has sharply decreased. In terms of the frequency by type of stroke, cases with cerebral hemorrhage were on the decrease but those with cerebral infarction were on the increase.
