escape beat(redirected from escape contraction)
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.
1. a heartbeat resulting from the production of a ventricular complex by a supraventricular source following a period of atrioventricular dissociation.
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.
an automatic beat, usually arising from the AV junction or ventricle, occurring after the next expected normal beat has defaulted; it is therefore always a late beat, terminating a longer cycle than the normal.
Synonym(s): escape contraction
Etymology: ME, escapen, to flee; beten, to beat
an automatic beat of the heart that occurs after an interval equal to or longer than the duration of its normal cycle. Escape beats function as safety mechanisms, and anything that produces a long pause in the prevailing heart cycle may allow an escape to occur. Pauses in which escape beats occur may be caused by sinoatrial block, atrioventricular (AV) block, or sinus bradycardia. Escape beats may arise from the atria, the AV junction, or the ventricles.
escape beatCardiology An automatic beat occurring after an interval longer than the dominant cycle length, ie a normal ventricular contraction, which occurs when the usual cardiac pacemaker–the sinoatrial node–defaults
es·cape beat(es-kāp' bēt, es-kāpt')
An automatic beat, usually arising from the atrioventricular junction or ventricle, occurring after the next expected normal beat has defaulted; it is therefore always a late beat, terminating a longer cycle than the normal.