Shunsuke Fujiwara1, Nobuyasu Komasawa2, Toshiaki Minami3. 1. Assistant Professor Department of Anesthesiology, Osaka Medical College, Osaka, Japan. 2. Assistant Professor Department of Anesthesiology, Osaka Medical College, Osaka, Japan. Electronic address: ane078@poh.osaka-med.ac.jp. 3. Professor and Chief Department of Anesthesiology, Osaka Medical College, Osaka, Japan.