| 释义 |
DictionarySeeextrasystoleEncyclopediaSeeExtrasystoleatrioventricular extrasystole
extrasystole [ek″strah-sis´to-le] a premature cardiac contraction that is independent of the normal rhythm and arises in response to an impulse outside the sinoatrial node.atrial extrasystole one in which the stimulus is thought to arise in the atrium elsewhere than at the sinoatrial node.atrioventricular extrasystole one in which the stimulus is thought to arise in the atrioventricular node.interpolated extrasystole a contraction taking place between two normal heartbeats.nodal extrasystole atrioventricular extrasystole.retrograde extrasystole a premature ventricular contraction followed by a premature atrial contraction, due to transmission of the stimulus backward, usually over the bundle of His.ventricular extrasystole one in which either a pacemaker or a re-entry site is in the ventricular structure.junc·tion·al ex·tra·sys·to·lea premature beat arising from the AV junction and leading to a simultaneous or almost simultaneous contraction of atria and ventricles. Synonym(s): atrioventricular extrasystoleatrioventricular extrasystolen. A premature contraction of the heart in which the stimulus arises from either the AV node or muscle-fiber bundle. |