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Mechanistic Heterogeneity of Junctional Ectopic Tachycardia in Adults
Author(s) -
LIU CHRISTOPHER F.,
IP JAMES E.,
LIN ANDY C.,
LERMAN BRUCE B.
Publication year - 2013
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.2011.03214.x
Subject(s) - medicine , tachycardia , cardiology , automaticity , adenosine , electrophysiology , mechanism (biology) , philosophy , cognition , epistemology , psychiatry
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)