reentry

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.

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re·en·try (')rē-'en-trē n, pl -tries a cardiac mechanism that is held to explain certain abnormal heart actions (as tachycardia) and that involves the transmission of a wave of depolarization along an alternate pathway when the original pathway is blocked with return of the impulse along the blocked pathway when the alternate pathway is refractory and then transmission along the open pathway resulting in an abnormality

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re·en·try (re-enґtre) 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 can exist over either an anatomical or a functional area of slowed impulse conduction and requires also refractoriness of tissue to stimulation and an area of unidirectional block to conduction. See also reflection and reentrant mechanism, under mechanism. reentrant adj

Medical dictionary. 2011.

Look at other dictionaries:

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  • reentry — or re entry [rē en′trē] n. pl. reentries 1. a reentering; specif., a coming back, as of a space vehicle, into the earth s atmosphere 2. a second or repeated entry 3. Card Games a card that can win a trick and thus regain the lead 4. Law a coming… …   English World dictionary

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  • reentry — noun Date: 15th century 1. a retaking possession; especially entry by a lessor on leased premises on the tenant s failure to perform the conditions of the lease 2. a second or new entry 3. a playing card that will enable a player to regain the… …   New Collegiate Dictionary

  • reëntry — noun a) The act of entering again. b) An instance of reëntering …   Wiktionary

  • reentry — noun a) The act of reentering. b) The return of a spacecraft into the atmosphere …   Wiktionary

  • Reentry — Re|en|t|ry [ri: ɛntrɪ], der od. das; s, s [engl. re entry, aus re = wieder u. entry = Eintritt < frz. entrée, ↑ Entree]: 1. Wiedereingliederung eines Mitarbeiters in das Unternehmen nach längerer [krankheitsbedingter] Arbeitsunterbrechung. 2.… …   Universal-Lexikon

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