title: Atrial tachycardia arising from the right atrial inferoseptum masquerading as common atrial flutter.
abstract: Radiofrequency catheter ablation was performed in 2 patients with atrial tachycardia (AT). In both cases the AT originated from the inferoseptal portion of the right atrium, and the cycle length was 210 ms. The surface ECG demonstrated common counterclockwise atrial flutter, probably caused by functional block in the clockwise direction at the cavo-tricuspid isthmus and posterior right atrium with rapid activation of the origin. Although rare (2%), AT originating from the inferoseptum of the right atrium should be considered when the surface ECG exhibits common atrial flutter.
authors.affiliation: Division of Cardiology, Gunma Prefectural Cardiovascular Center, Maebashi, Japan.
authors.forename: Sachiko
authors.initials: S
authors.lastname: Ito
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tada
authors.forename: Akihiko
authors.initials: A
authors.lastname: Nogami
authors.forename: Shigeto
authors.initials: S
authors.lastname: Naito
authors.forename: Shigeru
authors.initials: S
authors.lastname: Oshima
authors.forename: Koichi
authors.initials: K
authors.lastname: Taniguchi
mesh_terms: D000328:Adult; D000368:Aged; D001282:Atrial Flutter / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D017115:Catheter Ablation; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D008297:Male; D013612:Tachycardia, Ectopic Atrial / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery