tachycardia

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tachycardia:

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 It might be outdated or ideologically biased.

Tachycardia

 

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.

tachycardia

[¦tak·ə¦kärd·ē·ə]
(medicine)
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 ?
A peripheral effect of the extract is favored by the fact that hypotension persists at important levels between five and sixty minutes after extract administration even though there is a reflex tachycardia.
Clinically, histamine release can cause hypotension secondary to direct vasodilation, reflex tachycardia, and bronchospasm, leading to increased airway resistance.
Esmolol 10mg/dose up to 50mg was given for reflex tachycardia of more than 100/min persisting for more than 10 minutes in the face of a urine output of more than 1ml/kg/hr.
Complications: Two patients in the NTG group had reflex tachycardia requiring injection esmolol 10 mg bolus up to a maximum of 30 mg.