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.