alternation

alternation
The occurrence of two things or phases in succession and recurrently; used interchangeably with alternans.
- cardiac a. the occurrence of any cardiac phenomenon every other beat.
- concordant a. a. in either the mechanical or electrical activity of the heart, occurring in both systemic and pulmonary circulations.
- discordant a. a. in cardiac activities of either the systemic or the pulmonary circulation, but not of both, or in both but oppositely directed in each.
- electrical a. of heart a disorder in which the ventricular or atrial complexes or both are regular in time but of alternating pattern; detected by electrocardiography. The P, PR segment, QRS, T, QRS-T, or P-QRST alternate singly or in combination.
- a. of generations a succession of generations of individuals like and unlike the original parents, or an a. of sexual and nonsexual generations.
- mechanical a. of the heart disorder in which contractions of the heart are regular but are alternately stronger and weaker.

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al·ter·na·tion (awl″tər-naґshən) [L. alternare to do by turns] the succession of two opposing or different events in turn.

Medical dictionary. 2011.

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  • Alternation — may refer to:*Alternation (card game) *Alternation (linguistics), a variation in the phonological form of a morpheme *Diathesis alternation *Alternation (algorithms), see Alternating Turing machine *R/N alternation, see Rhotacism * AlterNation, a …   Wikipedia

  • Alternation — Al ter*na tion, n. [L. alternatio: cf. F. alternation.] 1. The reciprocal succession of things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and… …   The Collaborative International Dictionary of English

  • alternation — ● alternation nom féminin Synonyme de disjonction. ● alternation (synonymes) nom féminin Synonymes : disjonction alternation [altɛʀnɑsjɔ̃] n. f. ÉTYM. XIVe, alternacion; lat. alternatio, du supin de alternare. → Alterner …   Encyclopédie Universelle

  • Alternation — (v. lat.), Ab od. Verwechslung. Daher Alternation der Größen, Verwechslung der Größen in ihrer Ordnung od. Stelle, z.B. ac u. ca; bei 2 Größen können deren nur 2, bei 3 schon 6, bei 424 u. s. s. vorgenommen werden, so daß 10 Größen 3,628,800 Mal… …   Pierer's Universal-Lexikon

  • alternation — Alternation, Alternatio. Par alternations, L un apres l autre, Chacun sa fois, ou à son tour, Alternis, Alterna vice, Alternis vicibus, Per alternas vices. Par alternation et changements d ans, Vicibus annorum …   Thresor de la langue françoyse

  • Alternation — (lat.), Abwechselung …   Meyers Großes Konversations-Lexikon

  • Alternation — (lat.), Abwechslung; alternātim, alternatīv, wechselweise, abwechselnd …   Kleines Konversations-Lexikon

  • Alternation — Alternation, Verwechslung, Veränderung, Abwechslung …   Herders Conversations-Lexikon

  • alternation — index cycle, interchange, sequence, vicissitudes Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • Alternation — Alternation,die:⇨Ablösung(2) …   Das Wörterbuch der Synonyme

  • alternation — (n.) mid 15c., from O.Fr. alternacion, from L. alternationem (nom. alternatio), noun of action from pp. stem of alternare (see ALTERNATE (Cf. alternate) (v.)) …   Etymology dictionary

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