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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 It might be outdated or ideologically biased.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 ?
We describe 2 ED patients with PSVT who converted to sinus rhythm without complications using the HDDB technique.
* Temporary cardiac pacing at a rate over the tachycardia rate can override and abolish a PSVT.
In this case, PSVT induced LV dysfunction leading to the LV thrombus formation.
ATPace(TM) is Duska's investigational intravenous pharmaceutical formulation of ATP for the acute treatment of paroxysmal supraventricular tachycardia (PSVT).
* if the patient develops PSVT with aberrant conduction, try adenosine.
It interrupts the PSVT episode within 2 hours in most situations."
Roughly one in every 200 people in the United States suffers from a type of rapid heartbeat known as paroxysmal supraventricular tachycardia (PSVT), in which more than one electrical circuit connects the heart's upper and lower chambers.
The BTR Port Sunlight Village Road Race is organised in conjunction with Port Sunlight Village Trust (PSVT), with sponsors Unilever supporting the race day for a fourth year, which features a 5K race and two-lap 10K followed by a children's 1K fun run.
Another common form of supraventricular tachyarrhythmia is the paroxystial supraventricular tachycardia (PSVT).