title: Preexcitation masking underlying aberrant conduction: an atriofascicular accessory pathway functioning as an ectopic right bundle branch.
abstract: Preexcitation and aberrant conduction both cause a broad QRS complex. An unusual case of an atriofascicular accessory pathway effectively functioning as an ectopic right bundle branch and responsible for both physiologically normal ventricular activation and pathologic preexcited tachycardias as part of a split AV node-bundle branch system is presented.
authors.affiliation: University of Ottawa Heart Institute, Ontario, Canada.
authors.forename: Ernest W
authors.initials: EW
authors.lastname: Lau
authors.forename: Martin S
authors.initials: MS
authors.lastname: Green
authors.forename: David H
authors.initials: DH
authors.lastname: Birnie
authors.forename: Robert
authors.initials: R
authors.lastname: Lemery
authors.forename: Anthony S L
authors.initials: AS
authors.lastname: Tang
mesh_terms: D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology*; D018780:Body Surface Potential Mapping; D002037:Bundle-Branch Block / Q000503:physiopathology*; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D011227:Pre-Excitation, Mahaim-Type / Q000503:physiopathology*; D013612:Tachycardia, Ectopic Atrial / Q000175:diagnosis* / Q000503:physiopathology