title: Harder Roads to Trek? Paradoxical Slowing of an Atrioventricular Reentrant Tachycardia With Contralateral Bundle Branch Block.
abstract: Slowing of the tachycardia with increase in cycle length and increase in VA time with ipsilateral bundle branch block is a characteristic feature of accessory pathway mediated AVRT. Contralateral bundle branch block has no effect on the tachycardia as it is not a part of the tachycardia circuit. We present an interesting phenomenon in which contralateral bundle branch block resulted in tachycardia slowing in a case of WPW syndrome.
authors.affiliation: Arrhythmia Services, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Syamkumar M
authors.initials: SM
authors.lastname: Divakara Menon
authors.affiliation: Arrhythmia Services, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Maryam
authors.initials: M
authors.lastname: Ayati
authors.affiliation: Arrhythmia Services, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Jeff S
authors.initials: JS
authors.lastname: Healey
mesh_terms: D058606:Accessory Atrioventricular Bundle; D000200:Action Potentials; D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology*; D002036:Bundle of His / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000503:physiopathology*; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006339:Heart Rate; D006801:Humans; D008297:Male; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000503:physiopathology*; D013997:Time Factors; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis / Q000503:physiopathology*
keywords: AV reentry; WPW syndrome; bundle branch block; catheter ablation