Takehito Sato1, Tomoko Okumura2, Kimitoshi Nishiwaki3. 1. Department of Anesthesiology, Nagoya University Graduate School of Medicine, Japan. Electronic address: takeoffflutter@yahoo.co.jp. 2. Department of Anesthesiology, Bantane Hospital, Fujita Health University, Japan. 3. Department of Anesthesiology, Nagoya University Graduate School of Medicine, Japan.