Toshinori Horiuchi1, Toshihiro Nagahata2. 1. Department of Anesthesia, Bell Land General Hospital, 500-3, Higashiyama, Naka-ku, Sakai, Osaka 599-8247, Japan. Electronic address: thoriuch@kcn.jp. 2. Department of Anesthesia, Bell Land General Hospital, 500-3, Higashiyama, Naka-ku, Sakai, Osaka 599-8247, Japan.