title: Radiofrequency catheter ablation of atrial tachycardia with unusual left atrial sites of origin: report of two cases.
abstract: Two cases of successful radiofrequency catheter ablation of adult-onset atrial tachycardia originating from the left atrium adjacent to the mitral annulus are presented. Endocardial catheter activation mapping performed by retrograde or atrial transseptal approach revealed presystolic activation at the successful ablation site in both patients, and fractionation during sinus rhythm and tachycardia in one. The 12-lead electrocardiographic P wave appearance was suggestive of a left atrial tachycardia origin in both cases.
authors.affiliation: Philadelphia Heart Institute, Pennsylvania, USA.
authors.forename: C
authors.initials: C
authors.lastname: Mallavarapu
authors.forename: D
authors.initials: D
authors.lastname: Schwartzman
authors.forename: D J
authors.initials: DJ
authors.lastname: Callans
authors.forename: C D
authors.initials: CD
authors.lastname: Gottlieb
authors.forename: F E
authors.initials: FE
authors.lastname: Marchlinski
mesh_terms: D017115:Catheter Ablation; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008875:Middle Aged; D013612:Tachycardia, Ectopic Atrial / Q000503:physiopathology / Q000601:surgery*