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see arrhythmiaarrhythmia
, disturbance in the rate or rhythm of the heartbeat. Various arrhythmias can be symptoms of serious heart disorders; however, they are usually of no medical significance except in the presence of additional symptoms.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an increase in the frequency of cardiac contractions. In some cases it is not perceived subjectively; in others, it is accompanied by palpitations.

A distinction is made between sinus tachycardia, or the accelerated generation of impulses in the sinus node of the heart, and paroxysmal tachycardia. Sinus tachycardia, manifested by contractions generally ranging between 90 and 120 per minute, may be caused by such physiological factors as increased environmental temperature, physical and mental tension, or the ingestion of food. Sinus tachycardia may also be caused by such pathological states as fever, anemia, diffuse toxic goiter, heart failure, and neurasthenia. Nervous and humoral influences on the heart, such as adrenalin and thyroxine, are important contributing factors in the genesis of sinus tachycardia. The accelerated rhythm of cardiac contractions may have an unfavorable effect on metabolism in the myocardium and on blood circulation. When tachycardia is a symptom of disease, the underlying disease is treated.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Excessive rapidity of the heart's action.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Supraventricular tachycardia (SVT) is a group of common rhythm disturbances, representing one of the most common classes of arrhythmia requiring medical attention.
Clozapine-induced supraventricular tachycardia and its treatment with verapamil.
Osswald, "Elevated troponin levels in absence of coronary artery disease after supraventricular tachycardia," Swiss Medical Weekly, vol.
Tan, "Comparison of treatment of supraventricular tachycardia by Valsalva maneuver and carotid sinus massage," Annals of Emergency Medicine, vol.
In sick sinus syndrome when the patient's symptoms could be attributed to tachyarrythmic episodes rather to the bradycardia, the most efficient treatment option is to treat the patient's paroxysmal supraventricular tachycardia by radiofrequency ablation, rather than using cardiac pacing.
Age differences between males and females according to type of arrhythmia Diagnosis Males ([dagger]) Females ([dagger]) SVT 56 (16-89) 58 (19-89) VT 69 (23-89) 69 (28-91) Palpitations 47 (15-88) 46 (13-100) Afib/Aund 66 (24-92) 73 (14-92) Kruskal-Wallis ANOVA ([double dagger]) p=0.000 p=0.000 Diagnosis Mann-Whitney U test ([double dagger]) SVT p=0.066 VT p=0.967 Palpitations p=0.568 Afib/Aund p=0.000 Kruskal-Wallis ANOVA ([double dagger]) Afib/Aund = atrial fibrillation/atrial undulation; SVT = supraventricular tachycardia; VT = ventricular tachycardia; ([dagger]) data are presented as median and range; ([double dagger]) statistical significance at p<0.05 Table 2.
We report this case because it presented as supraventricular tachycardia in a previously apparently normal individual and investigation revealed both WPW syndrome and Rheumatic Mitral stenosis --a rare combination.
A narrow complex tachycardia or supraventricular tachycardia usually has a QRS duration of <120 ms, unless there is bundle branch block or an intraventricular conduction abnormality.
[ClickPress, Mon Oct 27 2014] GlobalData's clinical trial report, "Supraventricular Tachycardia Global Clinical Trials Review, H2, 2014" provides data on the Supraventricular Tachycardia clinical trial scenario.
Six arrhythmias were included in the definition of arrhythmic events: supraventricular tachycardia; atrial fibrillation/flutter; a pause greater than 3 seconds; atrioventricular block; ventricular tachycardia; or polymorphic ventricular tachycardia/ventricular fibrillation.