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Identification of a Conduction Gap of the Mitral Isthmus by Using a Novel High-Density Mapping Catheter


  • Conflicts of Interest: None.

Address for reprints: Seiichiro Matsuo, M.D., Department of Cardiology, The Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan. Fax: 81-3-3459-6043; e-mail:


Peri-mitral atrial flutter, which is a type of macroreentrant atrial tachycardia circulating around the mitral annulus, was terminated with the guidance of the high-density mapping catheter. A 72-year-old woman with atrial fibrillation and atrial tachycardia presented with symptoms of congestive heart failure. The recurrent peri-mitral atrial flutter following the initial catheter ablation for atrial tachycardia and atrial fibrillation was terminated by radiofrequency application on the gap that was identified using a novel high-density mapping catheter. (PACE 2010; 1–4)