Nationwide co-operative study of intracranial aneurysm surgery in Japan.

Adult Male Risk Time Factors Adolescent Rupture, Spontaneous Data Collection Infant, Newborn Infant Intracranial Aneurysm Middle Aged 3. Good health 03 medical and health sciences 0302 clinical medicine Japan Child, Preschool Humans Female Child Aged
DOI: 10.1161/01.str.16.1.48 Publication Date: 2011-06-17T20:08:03Z
ABSTRACT
A cooperative study was made of 4750 intracranial aneurysm cases collected from 133 neurosurgical clinics in Japan by letter inquiry for the period of 2 years from January 1974 to December 1975. Among them, 4124 cases (87%) had a single aneurysm, and 626 cases (13%) had multiple ones. Direct radical surgery was done in 78% of all cases, carotid ligation in 2% and non-surgical treatment in 17%. Direct surgery in a mortality rate of 15% for ruptured aneurysm cases and 7% for nonruptured cases. Radical surgery within 24 hours after rupture had a mortality of 51%, while those within 1 week and 2 weeks were 39% and 30% respectively; grade I or II patients, however, showed much better surgical results even in early operations. The neurosurgical clinics included in this study were spread throughout most of Japan. Micro-surgical technic was already in use of aneurysm surgery at the time of this study in Japan.
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