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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 It might be outdated or ideologically biased.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 ?
Among the SVTs most common arrhythmia was noted to be AT (17.5%) followed by AVNRT (13.2%) and AVRT (10.4%).
Among other arrhythmias, 95% of AFL, 87% of AVNRT and 80% of AF cases were symptomatic.
Classification of tachycardia (AVJRT = atrioventricular junctional re-entrant tachycardia; AVNRT = atrioventricular nodal re-entrant tachycardia; AVRT = atrioventricular re-entrant tachycardia; BBB = bundle branch block; AVB = atrioventricular block).
Analysis of data sets from patients with AVNRT prior to RFA demonstrated confident decrease of all QoL parameters (Table 1).
(2006) documented pain syndrome in patients with AVNRT who in addition to cardiac arrhythmia syndrome suffered IHD, hypertensive disease and degenerative disk disorder with radicular syndrome.
AVNRT is the most common form of PSVT whose diagnosis can be strongly suspected based on the surface electrocardiogram alone.
Ablation of SVT targets specific electro-anatomical substrates which include the slow pathway in Atrioventricular Nodal Reentry Tachycardia (AVNRT), the accessory pathway in Atrioventricular Reentrant Tachycardia (AVRT) or an ectopic focus in Atrial Tachycardia (AT)3-6.
Approval was based on safety and efficacy data presented at a meeting of the FDA's Circulatory System Devices Panel in March, where the expert panel recommended 7-3 that the device be approved for treating AVNRT, with conditions including one that the manufacturer reestablish a patient registry to monitor the incidence of heart block and other adverse events.
Cryoablation was shown to have distinct advantages in para-Hisian APs and atrioventricular nodal reentrant tachycardia (AVNRT) (2, 3, 8, 9).