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.

ex·tra·sys·to·le

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

extrasystole

/ex·tra·sys·to·le/ (-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  atrial premature complex.
atrioventricular (AV) extrasystole  atrioventricular junctional premature complex.
infranodal extrasystole  ventricular e.
interpolated extrasystole  see under beat.
nodal extrasystole  atrioventricular e.
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  ventricular premature complex.

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.

extrasystole

ex·tra·sys·to·le

(eks'tră-sis'tŏ-lē)
An ectopic beat from any source in the heart.
Synonym(s): premature systole.

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.

extrasystole

a premature beat in the pulse rhythm, due to initiation of the cardiac impulse at an abnormal focus. This ectopic beat is followed by a prolonged pulse interval.

extrasystole

ectopic, and usually premature, contraction of heart muscle interrupting normal sinus rhythm

ex·tra·sys·to·le

(eks'tră-sis'tŏ-lē)
A nonspecific word for an ectopic beat from any source in the heart.

extrasystole (ek´strəsis´tōlē),

n a heartbeat occurring before its normal time in the rhythm of the heart and followed by a compensatory pause.

extrasystole

a premature cardiac contraction that is independent of the normal rhythm and arises in response to an impulse outside the sinoatrial node.

atrial extrasystole
premature beat arising from stimuli discharged in atrial wall ectopic to atrial pacemaker and may or may not initiate cardiac irregularity.
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.
triggered extrasystole
cardiac ectopic beats triggered by afterdepolarizations.
ventricular extrasystole
one in which either a pacemaker or a re-entry site is in the ventricular structure.
References in periodicals archive ?
He noted that there were regular pauses every 3 to 4 beats, but the small extra pulse seen during pauses after extrasystoles was absent.
In the first series of experiments, intravenous ouabain continuous infusion resulted in disturbances of cardiac rhythm progressing from sinus arrhythmia, premature ventricular and supraventricular polytopic extrasystoles to ventricular tachycardia, ventricular fibrillation or cardiac arrest, in all control guinea-pigs.
Detection and evaluation of arrhythmias (supraventricular extrasystoles (SES), supraventricular tachycardia (SVT), ventricular extrasystoles (VES) and ventricular tachycardia (VT)) were performed with 12-lead ECG and 24-hour Holter monitoring records with reference to classic electrocardiographic criteria (12-14).
Infrequent cardiovascular side effects of mirtazapine include ventricular extrasystoles and bradycardia.
Sinus tachycardia and various arrhythmias, including ventricular extrasystoles and atrial fibrillation are common without myocardial damage (1); bradycardia and atrioventricular block may occur in more severe cases.
For example, electrical myocardial instability is accompanied by extrasystoles with a supracompensative pause on the sympathetic wave peak, after it HRV wave structure changed, often manifesting by decrease of all waves.
Phase 2 EADs could be associated with malignant "R on T" extrasystoles, initiating polymorphic VT.
However, in spite of the "rich" network of Purkinje fibres, various disturbances of electrical conduction including ventricular extrasystoles are observed in avian hearts (6-8).