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

(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.

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.
References in periodicals archive ?
Interrater reliability was analyzed for the four categories: "ventricular extrasystole," "supraventricular extrasystole," "extrasystole of unknown origin," and "erroneous detection" using unweighted Cohen's kappa.
Objective: To determine the relationship between levels of anxiety and burnout and prevalence of atrial extrasystoles (AESs) and ventricular extrasystoles (VESs) among critical care nurses.
During the electrophysiology study (Figures 3 and 4) the baseline ECG showed sinus rhythm, 88 bpm (beats per minute), AQRS=+30 degrees, left ventricular hypertrophy and supraventricular extrasystoles. AH 60 ms, HV 52 ms.
These modifications can lead to an increase in the spontaneous release of [Ca.sup.2+] from SR and could generate [Ca.sup.2+] waves, thus producing cardiac abnormal electrical activity and extrasystoles (5,18).
Sinus tachycardia, atrial ectopic beats, ST changes, ventricular extrasystoles, sinus arrhythmia, 1deg AV block, left bundle branch block, right bundle branch block were found in cited cases.
In our study, when two groups were compared arrhythmia (ventricular or atrial premature beats and extrasystoles), (p<0.05), AV block (p<0.05) and LBBB (p<0.01) were observed less in the bicaval group.
In addition, we found that irregular heart rhythms, such as atrial fibrillation or multiple extrasystoles made use of the algorithm cumbersome.
In all control guinea-pigs, intravenous administration of pitressin resulted in the typical electrocardiographic signs of coronary arterial spasm (ST-Segment elevation, increase voltage or inversion of the T-wave, prolongation of the P-Q and Q-T intervals), in an elevation of arterial blood pressure of 40.5[+ or -]3.0 mmHg and in the disturbances of cardiac rhythm characterized by ventricular extrasystoles followed by paroxysmal ventricular tachycardia of short duration, intervalated by bradicardic sinusal rhythm with atrioventricular blocks.
Some of the subjects were taking long-acting nitrates or [beta]-blockers for coronary disease or verapamil for ventricular extrasystoles. These drugs were withdrawn 1 week before the test.
Three of the patients having supraventricular tachycardia were treated with beta-blockers, the others had atrial extrasystoles. Extended Pwd duration was determined in all patients who developed atrial arrhythmias.
Excluded cardiac pathology Excluded medication Blood pressure of 180/100 mmHg Cardiac glycosides, or more calcium antagonists Myocardial infarction within the ACE inhibitors previous 6 months Angina pectoris at rest Sympathomimetics Myocarditis Anti-arrhythmics Atrial fibrillation Vasodilators Valvular defect Diuretics Ejection fraction < 45% or signi- Long-acting nitrates ficant ventricular dysfunction Ventricular extrasystoles, class Beta blockers IVb or V according to Lown 2nd or 3rd degree AV block Calcium antagonists Left or right bundle-branch block Table 3.