Address for correspondence:
Seigo Yamashita, M.D., Ph.D.
Division of Cardiology, Department of Internal Medicine, The Jikei University School of Medicine, 3-19-18 Nishishinbashi, Minato-ku, Tokyo, Japan
E-mail: seigoy722@yahoo.co.jp
Funding: none
Conflict of interest: RS: None, SY: None, HO: None, KT: None, MY and TY: There is no COI to disclose directly related to this study.
Key words: Atrial fibrillation, Catheter ablation, Inferior vena cava, Concealed bigeminy