Conflicts of Interest: None.
Mechanistic Heterogeneity of Junctional Ectopic Tachycardia in Adults
Article first published online: 28 SEP 2011
©2011, The Authors. Journal compilation ©2011 Wiley Periodicals, Inc.
Pacing and Clinical Electrophysiology
Volume 36, Issue 1, pages e7–e10, January 2013
How to Cite
LIU, C. F., IP, J. E., LIN, A. C. and LERMAN, B. B. (2013), Mechanistic Heterogeneity of Junctional Ectopic Tachycardia in Adults. Pacing and Clinical Electrophysiology, 36: e7–e10. doi: 10.1111/j.1540-8159.2011.03214.x
- Issue published online: 9 JAN 2013
- Article first published online: 28 SEP 2011
- Manuscript Accepted: 6 JUN 2011
- Manuscript Revised: 20 MAY 2011
- Manuscript Received: 16 MAR 2011
- junctional ectopic tachycardia;
- abnormal automaticity;
- triggered activity
Spontaneous junctional ectopic tachycardia (JET) in adults is rare, and the electrophysiologic mechanism has not been definitively established. Two patients who presented with JET, not associated with cardiac surgery, were evaluated and studied in the electrophysiology laboratory, and electrophysiologic and pharmacologic maneuvers were performed to assess the mechanisms of tachycardia. The junctional tachycardia in Patient 1 manifested characteristics consistent with a triggered mechanism, and was sensitive to adenosine. The junctional tachycardia in Patient 2 manifested characteristics consistent with abnormal automaticity, and was insensitive to adenosine. This is a rare clinical example of abnormal automaticity. These two cases demonstrate that JET may be due to multiple mechanisms, with data consistent with triggered activity and abnormal automaticity.
(PACE 2013; 36:e7–e10)