beat (bēt) a throb or pulsation, as of the heart or of an artery.
apex beat,
apex beat
apex beat the beat felt over the apex of the heart, normally in or near the fifth left intercostal space.
atrioventricular (AV) junctional escape beat a depolarization initiated in the atrioventricular junction when one or more impulses from the sinus node are ineffective or nonexistent.
atrioventricular (AV) junctional premature beat see under complex.
capture beats in atrioventricular dissociation, occasional ventricular responses to a sinus impulse that reaches the atrioventricular node in a nonrefractory phase.
ectopic beat a heart beat originating at some point other than the sinus node.
escape beat , escaped beat heart beats 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.
heart beat heartbeat.
interpolated beat a contraction occurring exactly between two normal beats without altering the sinus rhythm.
junctional escape beat atrioventricular junctional escape b.
junctional premature beat atrioventricular junctional premature complex.
postectopic beat the normal beat following an ectopic beat.
premature beat extrasystole.
pseudofusion beat an ineffective pacing stimulus delivered during the absolute refractory period following a spontaneous discharge but before sufficient charge accumulates to prevent pacemaker discharge.
reciprocal beat a cardiac impulse that in one cycle causes ventricular contraction, travels backward toward the atria, then reexcites the ventricles.
reentrant beat any of the characteristic beats of a reentrant circuit.
retrograde beat a beat resulting from impulse conduction that is backward relative to the normal atrioventricular direction.
ventricular escape beat an ectopic beat of ventricular origin occurring in the absence of supraventricular impulse generation or conduction.
ventricular premature beat (VPB) see under complex.
| apex beat n. A pulsation, either visible or palpable or both, made by the apex of the left ventricle of the heart as it strikes the chest wall in systole. |
apex beat,
a pulsation of the left ventricle of the heart, palpable and sometimes visible at the fifth intercostal space, approximately 9 cm to the left of the midline. Also called apical beat.
apex
pl. apices [L.] the pointed end of a cone-shaped part.
See also apical.
apex beat
see cardiac impulse.
cardiac apex
lies above the last sternebra and close to the sternal part of the diaphragm.
constricted apex
an apical foramen of a tooth is smaller than the adjacent root canal.
dilated apex
an apical foramen of a tooth is wider than the adjacent root canal.
nasal apex
the dorsal crescent of the snout of the pig.
tooth apex
end of a tooth root.
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.
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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.
apex beat
Apical thrust, cardiac impulse Cardiology A cardiac pulsation that corresponds to the impact of the apex–left ventricular as it rotates forward during systole; the AB is palpable or visible on the anterior chest wall in the
5th left intercostal space, and may be displaced by heart–eg enlarged right ventricle or aortic aneurysm or lung–eg dilated pulmonary artery disease. See Apexcardiography.
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