title: Tachycardia and bradycardia coexisting in the same pulmonary vein.
abstract: During segmental isolation of the pulmonary veins (PVs) in a patient with paroxysmal atrial fibrillation, there was a PV bradycardia that was dissociated from the left atrium in a segment of the right superior PV, whereas the remaining segments showed passive activation of a PV fascicle during sinus rhythm. Rapid atrial pacing induced a PV tachycardia in the nonisolated fascicles, and the dissociated PV bradycardia persisted in a segment of the same PV. These observations indicate that PV fascicles are insulated from each other and that a dissociated PV rhythm does not necessarily indicate complete isolation of a PV.
authors.affiliation: Department of Internal Medicine, University of Michigan, Ann Arbor 48109-0022, USA. oralh@umich.edu
authors.forename: Hakan
authors.initials: H
authors.lastname: Oral
authors.forename: Bradley P
authors.initials: BP
authors.lastname: Knight
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tada
authors.forename: Fred
authors.initials: F
authors.lastname: Morady
mesh_terms: D001281:Atrial Fibrillation / Q000209:etiology*; D001919:Bradycardia / Q000150:complications*; D022062:Electrophysiologic Techniques, Cardiac; D006801:Humans; D008297:Male; D008875:Middle Aged; D011667:Pulmonary Veins / Q000503:physiopathology*; D013610:Tachycardia / Q000150:complications*