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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 It might be outdated or ideologically biased.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 ?
Occasionally, the RVOT aneurysms may rarely occur as an unusual reason of the RVOT tachycardia in adult patients [9-11].
An atrial tachycardia was diagnosed and she was initially cardioverted electrically and treated with beta blockers, but the symptoms returned.
The major indication for procedure was supraventricular tachycardia 376(59.97%).
In the settings of supraventricular tachycardia, ST depression can be seen but usually resolves after restoration of sinus rhythm.
Uzun, "Novel vagal maneuver technique for termination of supraventricular tachycardias," The American Journal of Emergency Medicine, vol.
The patient's ECG is consistent with SVT associating rate-dependent LBBB which is common in orthodromic atrio-ventricular reentry tachycardias [3].
* Regular, wide complex tachycardias include monomorphic VT (in 80% of cases), SVT with right BBB (RBBB) or LBBB, preexcited tachycardia over an accessory pathway, and pacemaker tachycardias.
An atrial flutter with a 240 ms tachycardia cycle length (TCL) was recorded.
Four years later, the patient (NYHA III) was admitted to the hospital with sustained ventricular tachycardia. He underwent percutaneous radiofrequency ablation in the right ventricle and implantation of the ICD (Virtuoso VR, Medtronic, Inc., Minneapolis, USA).
Both ablation lesions were created via transaortic access to the tricuspid annulus and zone between inferior vena cava and the baffle via femoral venous access, which terminated the tachycardia (Fig.
Out of which pathways were 131 (124 patients were having Wolff-Parkinson-White (WPW) and orthodromic reciprocating tachycardia 7).Among pathways Left sided pathways were 70.