Retrospective Survey of Endovascular Treatment for Ruptured Intracranial Aneurysm in Japan: Retrospective Endovascular Subarachnoid Aneurysm Treatment (RESAT) Study

Nobuyuki Sakai, Waro Taki, Shinichi Yoshimura, Toshio Hyogo, Masayuki Ezura, Yasushi Matsumoto, Yasushi Ito, Hiroshi Abe, Makoto Sonobe, Shigeki Kobayashi, Shigeru Nemoto, Yuichi Murayama, Yuji Matsumaru, Hidenori Oishi, Naoya Kuwayama, Shigeru Miyachi, Tomoaki Terada, Masaki Komiyama, Toshiyuki Fujinaka, Kenji SugiuKoichi Sato, Ichiro Nakahara, Kiyoshi Kazekawa, Masaru Hirohata, Akio Hyodo, Chiaki Sakai

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8 Citations (Scopus)


Annual retrospective surveys of 20 to 31 medical centers performing endovascular treatment of cerebral aneurysms in Japan from 1997 to 2008 were performed to analyze technical and clinical outcomes of endovascular treatment for ruptured cerebral aneurysm. Patients treated with dome embolization using bare platinum coils within 14 days after onset were retrospectively selected, and clinical features, and technical and clinical outcomes at discharge were studied. Retrospective Endovascular Subarachnoid Aneurysm Treatment (RESAT) 1 covers patients treated from 1997, when the Guglielmi detachable coil was introduced, to 2002, just after International Subarachnoid Aneurysm Trial was reported. RESAT 2 to RESAT 7 were conducted annually between 2003 and 2008. Among 5,624 patients with ruptured aneurysms treated within 14 days after onset, 4,782 patients were treated by dome embolization using platinum detachable coils. The patients in this large retrospective survey included 35.8% aged over 70 years, 36.6% with posterior circulation aneurysms, and 29.3% with poor grades (Hunt and Kosnik grades IV and V). The proportion of patients aged over 70 years tended to increase each year from 33.4% in RESAT 1 to 39.8% in RESAT 7, and the proportion of those with posterior circulation aneurysms decreased from 44.2% in RESAT 1 to 23.8% in RESAT 7 (p<0.001). Overall technical success was obtained in 4,666 patients (97.6%), and favorable clinical outcome (good recovery and moderate disability) at discharge was obtained in 88.0% of grade I-III cases and 73.6% of grade I-V cases. Procedurerelated morbidity was 2.9% and mortality was 0.8%. Despite this survey involving high proportions of aged, posterior circulation, and poor-grade patients, the technical success rate and immediate clinical results were relatively favorable. The patient prognosis and aneurysm changes must be investigated over a longer period, together with the effects of the introduction of new endovascular devices for cerebral aneurysms.

Original languageEnglish
Pages (from-to)961-965
Number of pages5
Journalneurologia medico-chirurgica
Issue number11
Publication statusPublished - 2010


  • Clinical survey
  • Endovascular treatment
  • International subarachnoid aneurysm trial
  • Ruptured aneurysm
  • Subarachnoid hemorrhage

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology


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