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.

ex·tra·sys·to·le

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

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 ?
This study aimed to investigate the relationship between levels of anxiety and burnout and the prevalence of atrial extrasystoles (AESs) and ventricular extrasystoles (VESs) among critical care nurses.
2+] load which is responsible for the generation of delayed after depolarizations (DADs), which, if sufficiently large, may achieve threshold and generate spontaneous action potentials, leading to extrasystoles and ventricular arrhythmias.
9-11,13 Altered load changes myocardial segment length that, acutely, can result in decreased resting potential and the occurrence of after-depolarizations that cause extrasystoles in the region of greatest stretch.
Severe sympathetic discharge is often seen during dental procedures, presenting with hypertension, tachycardia and ventricular extrasystoles.
Those reactions are accompanied by various symptoms, typical for the developed picture of a HIV-infection: problem with the breathing, rhinorrhea, obstruction of respiratory tracts, extrasystoles, gastro-intestinal disturbances leading to loose stool and diarrhea.
This includes chapters on and common arrhythmias and ectopics and extrasystoles.
Arrythmias Major Minor * Nonsustained or sustained VT of * Nonsustained or sustained VT LBBB[dagger] morphology with or RV outflow configuration, superior axis (negative or LBBB morphology with inferior indeterminate QRS in leads II, III, axis (positive QRS in leads II, aVF and positive in lead aVL) III, and a VF and negative in lead aVL) or of unknown axis * >500 ventricular extrasystoles per 24 hours (Holter) VI.
determined ECG disorder such as sinus tachycardia or bradycardia, bundle branch conduction defects, non-specific ventricular repolarization disturbances, supraventricular and ventricular extrasystoles, prolonged QT interval, low voltage of the QRS complexes in standard limb leads, atrioventricular block first-degree, and atrial fibrillation in patients with HFRS.
Frequent ventricular extrasystoles during exercise indicate underlying cardiac disease [13].
Twelve patients had hemodynamic instability that required vasoconstrictors and 6 had arrhythmias, mainly supraventricular and ventricular extrasystoles.
2002) Increasing plasma potassium with amiloride shortens the QT interval and reduces ventricular extrasystoles but does not change endothelial function or heart rate variability in chronic heart failure.