title: Neurocardiogenic syncope in chronic atrioventricular block.
abstract: We report a 37-year-old man with type I second-degree atrioventricular (AV) block (atypical Wenckebach's periodicity) referred to our department for pacemaker implantation because of an episode of syncope. After exhaustive evaluation, including electrophysiological test, in which Wenckebach's cycles with block within the AV node was demonstrated, syncope was considered to be neurally mediated. Head-up tilt testing with sublingual isosorbide dinitrate was positive. The decrease in atrial rate at the beginning of the vasovagal reaction was not immediately accompanied by a depressed AV node conduction. Only at the moment of syncope did incomplete AV block appear. This observation illustrates (1) a neurally mediated origin of syncope in a patient with chronic AV block, and (2) the different time-course responses of the sinus and AV nodes to autonomic tone.
authors.affiliation: Department of Electrocardiology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico.
authors.forename: Celso
authors.initials: C
authors.lastname: Mendoza-González
authors.forename: Manlio F
authors.initials: MF
authors.lastname: Márquez
authors.forename: Antonio G
authors.initials: AG
authors.lastname: Hermosillo
authors.forename: Abdo
authors.initials: A
authors.lastname: Bisteni
authors.forename: Pedro Iturralde
authors.initials: PI
authors.lastname: Torres
authors.forename: Luis Colín
authors.initials: LC
authors.lastname: Lizalde
authors.forename: Manuel
authors.initials: M
authors.lastname: Cárdenas
mesh_terms: D000328:Adult; D002908:Chronic Disease; D004244:Dizziness / Q000175:diagnosis* / Q000209:etiology; D004562:Electrocardiography / Q000379:methods*; D006327:Heart Block / Q000150:complications* / Q000175:diagnosis*; D006801:Humans; D008297:Male; D019462:Syncope, Vasovagal / Q000175:diagnosis* / Q000209:etiology*; D015354:Vision, Low / Q000175:diagnosis* / Q000209:etiology