Effect of treatment modality and cerebral vasospasm agent on patient outcomes after aneurysmal subarachnoid hemorrhage in the elderly aged 75 years and older. oleh Keisuke Ido, Ryota Kurogi, Ai Kurogi, Kunihiro Nishimura, Koichi Arimura, Ataru Nishimura, Nice Ren, Akiko Kada, Ryu Matsuo, Daisuke Onozuka, Akihito Hagihara, So Takagishi, Keitaro Yamagami, Misa Takegami, Yasunobu Nohara, Naoki Nakashima, Masahiro Kamouchi, Isao Date, Takanari Kitazono, Koji Iihara, J-ASPECT Study Collaborators