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a premature beat arising from the AV junction and leading to a simultaneous or almost simultaneous contraction of atria and ventricles.
Synonym(s): atrioventricular extrasystole
Etymology: L, jungere, to join, extra, beyond; Gk, systole, contraction
a premature heartbeat that usually arises from the junction of the atrioventricular (AV) node and the AV bundle, the primary junctional pacing site, but may also arise from within the AV bundle.
extrasystole(eks?tra-sis'to-le) [? + Gr. systole, contraction]
Premature contraction of the heart. It may occur in the presence or absence of organic heart disease. It may be of reflex origin or may be triggered by stimulants (e.g., caffeine, cocaine, or theophylline), hypoxia, psychological stress, electrolyte abnormalities, thyroid disorders, or myocardial infarction.
Premature contraction of the atrium.
junctional extrasystoleNodal extrasystole.
Extrasystole occurring as a result of an impulse originating in the atrioventricular node. Synonym: junctional extrasystole
Premature ventricular beat.