title: Cycle length dependent block in the "mitral-pulmonary vein" isthmus.
abstract: We report a case of cycle length dependent activation sequence in the coronary sinus catheter during assessment of mitral-pulmonary vein isthmus block. A 61-year-old patient presented with atrial tachycardia following a recent pulmonary vein isolation for paroxysmal atrial fibrillation. A perimitral macroreentrant atrial tachycardia was demonstrated during mapping. The isthmus block observed following initial ablation of the mitral-pulmonary vein appeared to be pacing cycle dependent and to our knowledge has not been previously described.
authors.affiliation: Hôpital Cardiologique du Haut-Lévêque and the Université Victor Segalen Bordeaux II, Bordeaux, France.
authors.forename: Kang-Teng
authors.initials: KT
authors.lastname: Lim
authors.forename: Pierre
authors.initials: P
authors.lastname: Jaïs
authors.forename: Mark D
authors.initials: MD
authors.lastname: O'Neill
authors.forename: Sebastian
authors.initials: S
authors.lastname: Knecht
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Matsuo
authors.forename: Leonardo
authors.initials: L
authors.lastname: Arantes
authors.forename: Sathish
authors.initials: S
authors.lastname: Kodali
authors.forename: Mélèze
authors.initials: M
authors.lastname: Hocini
authors.forename: George
authors.initials: G
authors.lastname: Klein
authors.forename: Jacques
authors.initials: J
authors.lastname: Clémenty
authors.forename: Michel
authors.initials: M
authors.lastname: Haïssaguerre
mesh_terms: D000328:Adult; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D006329:Heart Conduction System / Q000601:surgery*; D006801:Humans; D011667:Pulmonary Veins / Q000601:surgery*; D016896:Treatment Outcome