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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 It might be outdated or ideologically biased.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 ?
This technique allowed them to study CMT type 2A over the lifetime of the lab animal.
The primary clinical manifestations of CMT include muscle weakness in the lower legs and hands.
Samples: CMT 2K is caused by alteration in GDAP1 gene primarily however it shows a variety of phenotypes among CMT 2K patients.
Diagnosis QT or CMT SCC Mastitis + a b Mastitis - c d CMT: California Mastitis Test; QT: Quick Test; SCC: Somatic Cell Count.
Aldean is nominated for male video of the year and has two nominations in the CMT performance of the year category.
We identified three unrelated CMT patients carrying heterozygous SH3TC2 variants, and the clinical details were summarized in [Table 2].
CMT Materials is the acknowledged leader in the design and development of syntactic foams for use as plug-assist materials.
As a first step in the partnership, 5miles has integrated CMT into the latest version of its app.
Charcot-Marie-Tooth (CMT) disease is a clinically and genetically heterogeneous group of disorders affecting the peripheral nervous system.
The inclusion criterion for eyes with refractory DME was a central macular thickness (CMT) of more than 300 [micro]m despite undergoing anti-VEGF therapy (5-6 monthly injections of ranibizumab (IVR) or bevacizumab (IVB) with shifting to aflibercept (IVA) for additional three injections).
Sophie Earl-Park suffers from Charcot-Marie-Tooth disease (CMT), a group of inherited disorders that damages nerves outside the brain and spine, as well as a number of other health conditions.
The celio-mesenteric trunk (CMT) is a rare vascular anomaly, characterized by the celiac artery branches and the superior mesenteric artery arising from a single trunk on the anterior wall of the abdominal aorta.