Yasuko Taketa1, Taro Fujitani2. 1. Department of Anesthesiology and Critical Care, Ehime Prefectural Central Hospital, Matsuyama City, Ehime 790-0024, Japan. Electronic address: suko1231@yahoo.co.jp. 2. Department of Anesthesiology and Critical Care, Ehime Prefectural Central Hospital, Matsuyama City, Ehime 790-0024, Japan.