title: Electrophysiologic characteristics and ablation of an atypical atrial flutter in the right atrium.
abstract: Subeustachian isthmus-dependent typical atrial flutter has been well studied. We demonstrate a case with atypical atrial flutter involving only the base of the right atrium around the inferior vena cava. Entrainment pacing and mapping studies documented a distinct circuit traversing the subeustachian isthmus, propagating through the posterobasal right atrium, and skirting the inferior vena cava. Successful radiofrequency ablation of the arrhythmia was accomplished by creating a linear lesion at the subeustachian isthmus. Mapping of the inferior vena cava region and the demonstration of concealed entrainment are essential steps in establishing the mechanism of the atypical atrial flutter.
authors.affiliation: Department of Medicine, China Medical College Hospital, Taichung, Taiwan.
authors.forename: K C
authors.initials: KC
authors.lastname: Chang
authors.forename: Y C
authors.initials: YC
authors.lastname: Lin
authors.forename: H T
authors.initials: HT
authors.lastname: Chou
authors.forename: J S
authors.initials: JS
authors.lastname: Hung
mesh_terms: D001282:Atrial Flutter / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D018780:Body Surface Potential Mapping; D017115:Catheter Ablation; D004452:Echocardiography; D005260:Female; D006325:Heart Atria / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology* / Q000601:surgery; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D013318:Stroke Volume