fusion beat

(redirected from combination beat)

beat

 [bēt]
a throb or pulsation, as of the heart or of an artery.
apex beat the beat felt over the apex of the heart in the point of maximal impulse.
atrial beat an ectopic beat originating in an atrium.
capture beat
1. a heartbeat resulting from the production of a ventricular complex by a supraventricular source following a period of atrioventricular dissociation.
2. in cardiac pacing terminology, the successful pacing of the heart by a pulse generator.
dropped beat absence of one ventricular contraction.
echo beat reciprocal beat.
ectopic beat a heartbeat originating at some point other than the sinus node.
escape beat (escaped beat) heartbeats that follow an abnormally long pause.
forced beat an extrasystole produced by artificial stimulation of the heart.
fusion beat in electrocardiography, a P or QRS complex that results from the concurrent activation of the atria or the ventricles by two stimuli in the same chambers. An atrial fusion beat results when the sinus beat coincides with an atrial ectopic beat, when two atrial ectopic beats coincide, or when an atrial or sinus beat coincides with retrograde conduction from a junctional focus. A ventricular fusion beat results when a ventricular beat coincides with a sinus beat, a ventricular ectopic beat, or a junctional beat.
junctional beat an ectopic beat originating at the atrioventricular junction; see also junctional rhythm.
premature beat a cardiac event resulting from discharge by an atrial, junctional, or ventricular focus before the next expected sinus beat and at an interval from the last sinus beat that is shorter than its own intrinsic rhythm.
reciprocal beat a heartbeat resulting from an atrial or ventricular complex caused by a return of an impulse to its chamber of origin; called also echo beat.
sinus beat a heartbeat with sinus rhythm.
ventricular beat an ectopic beat originating in a ventricle.

fu·sion beat

a beat 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.

fusion beat

in an electrocardiogram, a P wave or QRS complex resulting from the concurrent activation of the atria or the ventricles by two stimuli in the same chamber. An atrial fusion beat results when the sinus beat coincides with an atrial ectopic beat, when two atrial ectopic beats coincide, or when an atrial or sinus beat coincides with retrograde conduction from a junctional focus. A ventricular fusion beat results when a ventricular beat coincides with a sinus beat, a ventricular ectopic beat, or a junctional beat.

fusion beat

Cardiology The superimposing of an ectopic beat on a paced natural sinoatrial node beat; an FB is usually narrower than a paced impulse and has various morphologies that reflect the relative contributions of the impulse to the venticular depolarization. See Pseudofusion beat.

fu·sion beat

(fyū'zhŭn bēt)
A beat 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.

beat

a throb or pulsation, as of the heart or of an artery.

apex beat
the palpable shock caused by the apex of the heart beating against the chest wall with each systole and felt over the apex of the heart, normally in the fifth left intercostal space. May be replaced by a thrill.
Enlarge picture
Palpitation of the apex beat. By permission from Hinchcliff KW, Kaneps AJ, Equine Sports Medicine and Surgery, Saunders, 2004
capture b's
occasional ventricular responses to a sinus impulse that reaches the atrioventricular node in a nonrefractory phase.
ectopic beat
a heartbeat originating at some point other than the sinus node.
escaped b's
heartbeats that follow an abnormally long pause.
forced beat
an extrasystole produced by artificial stimulation of the heart.
fusion beat
in electrocardiography, the complex resulting when an ectopic ventricular beat coincides with normal conduction to the ventricle.
premature beat
an extrasystole.
References in periodicals archive ?
uk, in a poll of ten memorable efforts by readers of a British paper, the Swiss' fluid chest-and-volley combination beat off some classic competition from the likes of Paul Scholes, Paolo Di Canio, Thierry Henry and Robin van Persie.
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The third-seeded French-Swiss combination beat tenth seeds Virginia Ruano Pascual of Spain and Argentina's Paolo Suarez 6-2, 6-4 in an hour.
The XpressStack and XpressConnect combination beat out all competition in the magazine's File Throughput Test, performing 50 percent faster than any other solution tested.
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