title: A wide complex tachycardia with changing atrial activation sequence.
abstract: Change of the retrograde atrial activation sequence during radiofrequency (RF) ablation of left-side accessory pathway can be due to another accessory pathway, another mechanism for the tachycardia, or due to intraatrial conduction block, partial or complete, caused by RF delivery to a site proximal to the site of insertion of the accessory pathway. In this case report, a temporary complete intraatrial conduction block was created by RF delivery proximal to the site of accessory pathway insertion, causing a change in the retrograde atrial activation sequence during ongoing tachycardia that was terminated by ablation at the insertion site of accessory pathway.
authors.affiliation: Department of Electrophysiology, Royal Jubilee Hospital, Victoria, British Columbia, Canada. romeo@mbox303.swipnet.se
authors.forename: Romeo
authors.initials: R
authors.lastname: Ayou
authors.forename: Sharad
authors.initials: S
authors.lastname: Agarwal
authors.forename: Anthony
authors.initials: A
authors.lastname: Tang
authors.forename: Laurence D
authors.initials: LD
authors.lastname: Sterns
mesh_terms: D001281:Atrial Fibrillation / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery*; D017115:Catheter Ablation / Q000009:adverse effects*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D013617:Tachycardia, Supraventricular / Q000150:complications / Q000175:diagnosis* / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult