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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 It might be outdated or ideologically biased.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 ?
The specimen collected from Hunewell Ranch represents a range extension into the southwestern WCT from East Texas.
Clinical features can suggest the substrate of the WCT but electrocardiographic criteria and electrophysiology studies are indispensable for the definite etiological diagnosis.
In patients with a WCT, looking for P waves is less important and the following needs to be examined:
While WCT Holdings' construction segment would remain the largest contributor to the group, accounting for 72.8 per cent and 44.2 per cent of consolidated revenue and operating profit respectively in FY2014 (property development: 23.6 per cent; 37.8 per cent), MARC expects construction margins to remain thin amid competitive pressures.
The FWS assessed the status of WCT in 1997 in response to a listing petition and determined that WCT stocks were healthy enough to not warrant listing.
About WCT (Canadian Women in Communication and Technology)
WCT claimed at the time that work was 60 per cent completed, yet they had only been paid for 28 per
Arabtec and WCT had filed an arbitration case in early 2009 and negotiations took place between the parties from April to October 2010.
Bahrain acceded to both WCT and WPPT on 15th December 2005.
9 December 2010 - MARC on Wednesday gave its AA- rating to Malaysian engineering services provider WCT Berhad's (KUL:WCT) MYR600m (USD191m/EUR145m) serial fixed-rate bonds with 193.7 million detachable warrants.
Integrated features include eight low-noise programmable gain amplifiers (PGAs), eight high-resolution, simultaneous sampling analog-to-digital converters (ADCs), amplifier for right-leg drive, amplifiers for Wilson Center Terminal (WCT) and Goldberger Terminals (GCT), digital pace detection capability, continuous lead-off detection and onboard oscillator and reference.
Black Country Reinvestment Society (BCRS) has loaned the money to Walsall Community Transport (WCT), which puts on transport to schools and community groups that are not served by direct bus routes.