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

• DOI: 10.1161/01.str.16.1.48
• Publication Date: 2011-06-17T20:08:03Z
• Authors: A Nishimoto; K Ueta; H Onbe; K Kitamura; T Omae; F Goto; G Ohneda; H Chigasaki; M Tsuru; J Suzuki
• Keywords: 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

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.