reentry

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reentry

 [re-en´tre]
in cardiology, reexcitation of a region of cardiac tissue by a single impulse, continuing for one or more cycles and sometimes resulting in ectopic beats or tachyarrhythmias; see also circus movement.
atrioventricular (AV) nodal reentry an arrhythmia-causing mechanism in which two opposing pathways are established within the atrioventricular node (longitudinal dissociation); the anterograde pathway, which is usually slower, activates the ventricles and the retrograde pathway, which is usually faster, activaties the atria. This mechanism is responsible for approximately half of symptomatic paroxysmal supraventricular tachycardias.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

re·en·try

(rē-en'trē),
Return of the same impulse into a zone of heart muscle that it has recently activated, sufficiently delayed that the zone is no longer refractory, as seen in most ectopic beats, reciprocal rhythms, and most tachycardias.
Farlex Partner Medical Dictionary © Farlex 2012

re·en·try

(rē-en'trē)
Return of the same impulse into a zone of heart muscle that it has recently activated, sufficiently delayed so that the zone is no longer refractory, as seen in most ectopic beats, reciprocal rhythms, and most tachycardias.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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