title: Atrioventricular nodal tachycardia in the absence of retrograde conduction.
abstract: A patient with atrioventricular (AV) nodal reentrant tachycardia assessed by electrocardiographic and electrophysiological criteria is described. During ventricular pacing, retrograde conduction was absent at the longest cycle length tested with the site of block determined to be the AV node by concealed conduction criteria. These findings localize the tachycardia circuit above the His bundle and exclude a His-atrial bypass tract as the retrograde limb of the tachycardia circuit in this patient.
authors.affiliation: University of Western Ontario, London.
authors.forename: R Z
authors.initials: RZ
authors.lastname: Molina
authors.forename: O
authors.initials: O
authors.lastname: Fujimura
authors.forename: A D
authors.initials: AD
authors.lastname: Sharma
authors.forename: R
authors.initials: R
authors.lastname: Yee
authors.forename: G J
authors.initials: GJ
authors.lastname: Klein
mesh_terms: D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006801:Humans; D008297:Male; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000503:physiopathology*; D013617:Tachycardia, Supraventricular / Q000503:physiopathology*