A single premature stimulation from the para-Hisian region unmasked negative involvement of the left anterior fascicle in the reentrant circuit of verapamil-sensitive ventricular tachycardia with a right bundle branch block and right-axis deviationMasahiro Toba, MDa, Toshihiro Nasu, CEb, Nobuyoshi Nekomiya, CEb, Ryo Itasaka, CEb, Takao Makino, MDa, Hisashi Yokoshiki, MD, PhDaaDepartment of Cardiovascular Medicine, Sapporo City General Hospital, Sapporo, JapanbDivision of Medical Engineering Center, Sapporo City General Hospital, Sapporo, JapanShort title : A single premature stimulation from the para-Hisian region unmasked negative involvement of the left anterior fasciculeAddress for correspondence :Masahiro Toba, M.D.E-mail: [email protected] Yokoshiki MD, PhDDepartment of Cardiovascular Medicine, Sapporo City General Hospital, Kita-11, Nishi-13, Chuo-ku, Sapporo 060-8604, Japan.Phone: 81-11-726-2211Fax: 81-11-726-7912E-mail: [email protected] Words : verapamil-sensitive ventricular tachycardia, the left anterior fascicle, reentry, single premature stimulation, para-Hisian region, radiofrequency ablation

A left bundle branch block morphology tachycardia with fragmented potentials at the His bundle area Masahiro Toba, MDa, Toshihiro Nasu, CEb, Nobuyoshi Nekomiya, CEb, Ryo Itasaka, CEb, Takao Makino, MDa, Hisashi Yokoshiki, MD, PhDaaDepartment of Cardiovascular Medicine, Sapporo City General Hospital, Sapporo, JapanbDivision of Medical Engineering Center, Sapporo City General Hospital, Sapporo, JapanAddress for correspondence :Hisashi Yokoshiki MD, PhDE-mail:[email protected] of Cardiovascular Medicine Sapporo City General Hospital, Kita-11, Nishi-13, Chuo-ku, Sapporo 060-8604, Japan.Phone: 81-11-726-2211Fax: 81-11-726-7912Key words : longitudinal dissociated his bundle, left bundle branch block morphology tachycardia, fragmented potentials, radiofrequency ablation