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[PP-232] Efficacy of tolvaptan for the atrial fibrillation patient after open heart surgery

^○KAZUYOSHI FUKAZAWA¹, Kaoru Matsuura², Hideki Ueda², Hiroki Kouno², Yoshinori Enomoto², Michiko Watanabe², Daisuke Hiraoka², Tomohiko Inui², Yasunori Yakita², Yutaka Wakabayashi², Masahiko Fujii², Tomoyoshi Kanda², Keiichi Ishida¹, Goro Matsumiya² (1.Eastern Chiba Medical Center, 2.Chiba University Hospital)