title: Double response of the ventricle during transient entrainment in a common atrioventricular nodal reentrant tachycardia.
abstract: We report a patient with slow-fast atrioventricular (AV) nodal reentrant tachycardia, in which double ventricular response was demonstrated during rapid pacing at cycle length of 300 msec or less from the high right atrium. The determinants of double ventricular response during transient entrainment in the present case were: (1) a crucial conduction delay in the slow pathway; (2) the collision between the activation via the antegrade fast pathway (antidromically) of the last paced beat and the activation via the antegrade slow pathway (orthodromically) of the previous paced beat, instead of the unidirectional block in the slow pathway; and (3) the enhanced AV nodal conduction over the antegrade fast pathway.
authors.affiliation: Third Department of Internal Medicine, Nagasaki University School of Medicine, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Shimizu
authors.forename: M
authors.initials: M
authors.lastname: Fukatani
authors.forename: O A
authors.initials: OA
authors.lastname: Centurion
authors.forename: A
authors.initials: A
authors.lastname: Konoe
authors.forename: S
authors.initials: S
authors.lastname: Isomoto
authors.forename: M
authors.initials: M
authors.lastname: Kaibara
authors.forename: K
authors.initials: K
authors.lastname: Yano
mesh_terms: D000328:Adult; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000503:physiopathology* / Q000628:therapy; D016276:Ventricular Function / Q000502:physiology*