title: Idiopathic left ventricular tachycardia with a change from left to right axis deviation during radiofrequency catheter ablation.
abstract: A 62 year-old-woman presented with a right bundle branch block (RBBB) and left axis deviation (LAD) tachycardia. Radiofrequency (RF) energy was delivered to the left posterior fascicle (LPF) where 2 presystolic Purkinje potentials (P1 and P2) preceding onset of the QRS complex were recorded. During RF energy applications, the QRS morphology of the tachycardia changed from RBBB and LAD to RBBB and right axis deviation without termination of the tachycardia. The Purkinje potential was observed following the QRS complex during the tachycardia because of conduction block of the LPF distal to the reentry circuit due to RF catheter ablation.
authors.affiliation: Division of Cardiovascular Disease, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Okumura
authors.forename: Ichiro
authors.initials: I
authors.lastname: Watanabe
authors.forename: Kimie
authors.initials: K
authors.lastname: Ohkubo
authors.forename: Kenichi
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Sonoko
authors.initials: S
authors.lastname: Ashino
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Kofune
authors.forename: Hidezou
authors.initials: H
authors.lastname: Sugimura
authors.forename: Atsushi
authors.initials: A
authors.lastname: Shindo
authors.forename: Toshiko
authors.initials: T
authors.lastname: Nakai
authors.forename: Satoshi
authors.initials: S
authors.lastname: Saito
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000503:physiopathology*; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006801:Humans; D008875:Middle Aged; D011690:Purkinje Fibers / Q000503:physiopathology; D017180:Tachycardia, Ventricular / Q000503:physiopathology* / Q000601:surgery*