extrasystole

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ex·tra·sys·to·le

(eks'tră-sis'tō-lē),
A nonspecific word for an ectopic beat from any source in the heart.
Farlex Partner Medical Dictionary © Farlex 2012

extrasystole

(ĕk′strə-sĭs′tə-lē)
n.
A premature contraction of the heart, resulting in momentary cardiac arrhythmia.

ex′tra·sys·tol′ic (-sĭ-stŏl′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ex·tra·sys·to·le

(eks'tră-sis'tŏ-lē)
An ectopic beat from any source in the heart.
Synonym(s): premature systole.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

extrasystole

A premature contraction of the heart. This is usually followed by a pause longer than the normal interval between heart beats and this is often perceptible to the subject. Extrasystoles are often described as palpitations. Ventricular extrasystoles are often described as VENTRICULAR ECTOPY.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

ex·tra·sys·to·le

(eks'tră-sis'tŏ-lē)
A nonspecific word for an ectopic beat from any source in the heart.
Medical Dictionary for the Dental Professions © Farlex 2012