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.

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.

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 ?
Italy is the great protagonist of the launch of the European atmospheric reentry demonstrator IXV, developed by Thales Alenia Space on behalf of the European Space Agency with the technical-scientific contribution of the Italian Space Agency, CIRA (Italian Aerospace Research Center) and Italian Universities, said Stefania Giannini Italian Minister of Instruction, University and Research.
The IXV reached a speed during its atmospheric reentry of approximately 7.5 km/sec at an altitude of 120 km, typical of a reentry from low Earth orbit, similar of those of the International Space Station.
The European Space Agency's IXV (Intermediate Experimental Vehicle) atmospheric reentry demonstrator, developed by Thales Alenia Space as prime contractor, has kicked off its launch campaign at the Guiana Space Center in French Guiana.
Radar performance was successfully measured during the harsh conditions of hypersonic atmospheric reentry.
IXV (Intermediate eXperimental Vehicle), the European Space Agency s atmospheric reentry demonstrator, developed and integrated by Thales Alenia Space as prime contractor, arrived today at the Guiana Space Center in Kourou, French Guiana, initiating preparations for the launch, scheduled for this coming November.

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