1. To strike; to throb or pulsate. 2. A stroke, impulse, or pulsation, as of the heart or pulse. 3. Activity of a cardiac chamber produced by catching a stimulus generated elsewhere in the heart. 4. The perception of a third tone when two tones of slightly different frequencies are presented. 5. One of a series of regularly pulsating tones created by the periodic mutual reinforcement of two simultaneously sounding tones that differ slightly in frequency. [A.S. beatan]
- apex b. the visible and/or palpable pulsation made by the apex of the left ventricle as it strikes the chest wall in systole; normally in the fifth intercostal space, about 10 cm to the left of the median line.
- atrial capture b. the cardiac cycle resulting when, after a period of A-V dissociation, the atria regain control of the ventricles; atrial depolarization due to retrograde transmission from a ventricular ectopic b. or an electronically paced ventricular impulse.
- atrial fusion b. a b. that occurs when the atria are activated in part by the sinus impulse and in part by an ectopic or retrograde impulse from A-V junction or ventricle.
- automatic b. in contrast to forced b., an ectopic b. that arises de novo and is not precipitated by the preceding b.; thus escaped and parasystolic beats are automatic. SYN: automatic contraction.
- combination b. SYN: fusion b..
- coupled beats beats (usually premature) that recur at a fixed interval from a preceding (usually normal) b..
- dependent b. SYN: forced b..
- Dressler b. fusion b. interrupting a ventricular tachycardia and producing a normally narrow QRS complex as a result of the fusion of two impulses, one impulse from the ventricular tachycardia and the other from a supraventricular focus; Dressler beats strongly support the diagnosis of ventricular tachycardia by interruption of it.
- dropped b. a heart b. that fails to appear.
- echo b. extrasystole produced by the return of an impulse in the heart retrograde to a focus near its origin which then returns antegradely to produce a second depolarization.
- ectopic b. a cardiac b. originating elsewhere than at the sinoatrial node.
- escape b. an automatic b., usually arising from the AV junction or ventricle, occurring after the next expected normal b. has defaulted; it is therefore always a late b., terminating a longer cycle than the normal. SYN: escape contraction.
- forced b. 1. an extrasystole supposedly precipitated in some way by the preceding normal b. to which it is coupled; 2. an extrasystole caused by artificial stimulation of the heart. SYN: dependent b..
- fusion b. a b. triggered by more than a single electrical impulse, when the wave fronts coincide to act together on a single final pathway of activity; in the electrocardiogram, the atrial or ventricular complex when either atria or ventricles are activated jointly by two simultaneous or nearly simultaneous invading impulses. SYN: combination b., mixed b., summation b..
- heart b. a complete cardiac cycle, including spread of the electrical impulse and the consequent mechanical contraction. SYN: ictus cordis.
- mixed b. SYN: fusion b..
- paired beats bigeminy.
- parasystolic b. SYN: parasystole.
- pseudofusion b. an electrocardiographic representation of a cardiac depolarization produced by superimposition of an ineffectual electronic pacemaker spike upon a QRS-complex originating from a spontaneous focus within the heart; the pacemaker spike is ineffectual because the electronic discharge, which it represents graphically, occurred within the absolute refractory period of the spontaneous b. and is therefore not indicative of pacemaker malfunction.
- reciprocal b. reciprocal rhythm.
- retrograde b. a b. occurring as an electrical activation of a portion of a heart chamber cephalad to the chamber of origin, e.g., an atrial b. triggered by an impulse originating in the ventricle.
- summation b. SYN: fusion b..
- ventricular fusion b. a fusion b. that occurs when the ventricles are activated partly by the descending sinus or AV junctional impulse and partly by an ectopic ventricular impulse.

* * *

beat 'bēt vi, beat; beat·en 'bēt-ən or beat; beat·ing PULSATE, THROB
beat n a single stroke or pulsation (as of the heart) <ectopic \beats> see EXTRASYSTOLE

* * *

(bēt) a throb or pulsation, as of the heart or of an artery; see also pulse.

Medical dictionary. 2011.


Look at other dictionaries:

  • béat — béat …   Dictionnaire des rimes

  • Beat — may refer to: * Battery (crime), contact on another person in a manner likely to cause bodily harm * Beating upMusic* Beat (music), a pulse of sound that marks the metre or rhythm of a piece of music * Beatmatching, the aligning of the tempos of… …   Wikipedia

  • Beat It — Single par Michael Jackson extrait de l’album Thriller Face B Burn This Disco Out (R U) / Get on the Floor Sortie Février 1983 Enregistrement 1982 …   Wikipédia en Français

  • Beat — (b[=e]t), v. t. [imp. {Beat}; p. p. {Beat}, {Beaten}; p. pr. & vb. n. {Beating}.] [OE. beaten, beten, AS. be[ a]tan; akin to Icel. bauta, OHG. b[=o]zan. Cf. 1st {Butt}, {Button}.] 1. To strike repeatedly; to lay repeated blows upon; as, to beat… …   The Collaborative International Dictionary of English

  • Beat It — Michael Jackson Veröffentlichung 26. Februar 1983 Länge 4:17 Genre(s) Pop Autor(en) Michael Jackson …   Deutsch Wikipedia

  • Beat it — Single par Michael Jackson extrait de l’album Thriller Face B Burn this Disco Out Sortie Février 1983 …   Wikipédia en Français

  • Beat 'em up — Beat em ups (often called scrolling fighting games, fighting action games, scrolling beat em ups or sometimes brawlers) are video games where close combat fighting against multiple opponents is the main objective. Beat em ups based around mêlée… …   Wikipedia

  • Beat'em up — Beat them all Le beat them all (ou beat em all, de l anglais « battez les tous », aussi appelé parfois scrolling fighter) est un type de jeu vidéo opposant un ou deux joueurs à un nombre important d ennemis. Le principe du jeu est d… …   Wikipédia en Français

  • Beat 'em up — Beat them all Le beat them all (ou beat em all, de l anglais « battez les tous », aussi appelé parfois scrolling fighter) est un type de jeu vidéo opposant un ou deux joueurs à un nombre important d ennemis. Le principe du jeu est d… …   Wikipédia en Français

  • Beat 'em up — Saltar a navegación, búsqueda Beat em up (también conocido como brawler) es un genero de videojuegos en el que se destaca el combate cuerpo a cuerpo entre el protagonista y un gran número de antagonistas. Los beat em ups basados en armas cuerpo a …   Wikipedia Español

  • beat — [ bit ] adj. inv. • v. 1966; de beatnik ♦ Anglic. Qui concerne les beatniks ou la « beat generation ». Jack Kerouac et Allan Ginsberg, écrivains beat. ⊗ HOM. Bit, bite, bitte. ● beat adjectif invariable (mot américain, abréviation de beatnik) Qui …   Encyclopédie Universelle

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.