reentry


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Related to reentry: reentry phenomenon

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.

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.

reentry

/re·en·try/ (re-en´tre) 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; it also requires refractoriness of the tissue to stimulation and an area of unidirectional block to conduction.reen´trant

reentry

[rē·en′trē]
Etymology: L, re, again; Fr, entrée
(in cardiology) the reactivation of myocardial tissue for the second or subsequent time by the same impulse. Reentry is one of the most common arrhythmogenic mechanisms. For example, paroxysmal supraventricular tachycardia may be caused by sinus nodal reentry, atrioventricular (AV) nodal reentry, or AV reentry by way of the AV node and an accessory pathway; atrial flutter is caused by an atrial macroreentry circuit. Reentry also underlies some forms of ventricular tachycardia and extrasystoles. AV and AV nodal reentry mechanisms may be terminated by a vagal maneuver, adenosine, or procainamide.

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.
References in periodicals archive ?
Major drawbacks to the methods already addressed was still the relatively short duration of velocities, temperatures and inability to reach the higher temperatures of reentry in a continuous flow wind tunnel.
Avco Corporation's Everett Research Laboratory and General Electric's Missile and Space Vehicle Division, amongst other labs, also employed variations of the arc-jet in their research and development of ablative materials for use on reentry vehicles.
These two papers extended that of Lester Lees published in 1956 which had been found to underestimate by as much as 30 percent heat transfer rates at the reentry vehicle tip.
125) Introducing a gradation of consequences and warnings that doesn't automatically move towards revocation is important because increased revocation rates have been one of the negative outcomes revealed by studies of reentry courts.
137) Reentry courts were in response to this, and even if they continue to grow at a comparatively small rate, even if their successes are not monumental, they offer one of the only real responses to the problem of prisoner inflation paired with no softening of the grim post-prison stigma.
The Federal Northern District of New York ("NDNY"), spotlighted at the outset of this essay, first implemented their Intensive Reentry Court ("IRC") in 2008.
The conditions of the returning citizens' communities also determine success of reentry.
Similarly, the level of support an ex-inmate has in the community can predict reentry outcomes.
In order to remedy the theoretically shallow nature of reentry research to date, scholars of punishment can turn a critical eye on criminal justice expertise and its role in naturalizing the status quo.
Without an understanding of the conditions that make mass imprisonment possible, we cannot hope to understand the politics of prisoner reentry or assess its potential pitfalls and opportunities.
Once released, the six-month reentry program begins.
103) Not only does the program utilize different treatment and therapy services in the community, but also overall community acceptance is necessary for a parolee to have a truly successful reentry into society.