Journal Article

Ectopic nodal structures in a patient with atrial tachycardia originating from the mitral valve annulus

Taka-aki Matsuyama, Shin Inoue, Kaoru Tanno, Mutsuki Makino, Genyo Ogawa, Tetsuo Sakai, Youichi Kobayashi, Takashi Katagiri and Hidekazu Ota

in EP Europace

Published on behalf of European Heart Rhythm Association of the European Society of Cardiology (ESC)

Volume 8, issue 11, pages 977-979
Published in print November 2006 | ISSN: 1099-5129
Published online September 2006 | e-ISSN: 1532-2092 | DOI: http://dx.doi.org/10.1093/europace/eul101
Ectopic nodal structures in a patient with atrial tachycardia originating from the mitral valve annulus

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We report a case, which we believe to be rare, of adenosine-sensitive atrial tachycardia (AT) originating from the mitral valve annulus. The patient, a 73-year-old woman, died of unrelated cause 4 years after radiofrequency (RF) ablation therapy. Histologically, fibrous replacement of atrial musculature by mature collagenous tissue produced by the RF current was observed at the left inferior atrioventricular junction. In serial sections that included the coronary sinus, two distinct nodal structures containing small, pale myocytes within the fibrous tissue matrix were identified around the region of the ablation lesion. Our case appears to be a unique representation of tissue that was associated with the occurrence and maintenance of AT.

Keywords: Atrial tachycardia; Ablation; Histology; Nodal tissue

Journal Article.  1328 words.  Illustrated.

Subjects: Cardiovascular Medicine

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