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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 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 It might be outdated or ideologically biased.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 ?
Sung et al., "Impact of apoptotic adipose-derived mesenchymal stem cells on attenuating organ damage and reducing mortality in rat sepsis syndrome induced by cecal puncture and ligation," Journal of Translational Medicine, vol.
Endotoxin binding to platelets in blood from patients with a sepsis syndrome. Clin Chem 1994;40:1575-9.
Through the present study, we sought to identify factors associated to mortality due to sepsis syndrome in children.
It is also possible that neutropenia could have been secondary to the sepsis syndrome.
Catheter-site signs of infection with sepsis syndrome was the most common finding (47.5%), followed by catheter-site signs of infection without sepsis syndrome (42.5%), as determined according to statements from Survival Sepsis Campaign,10 Only four patients had signs of infection at the site of catheter insertion and severe sepsis (10%).
There are several explanations for the increased prevalence of sepsis; in addition to a larger number of at-risk elderly patients, improved survival following trauma or malignancy provides for an expanding number of severely debilitated patients who remain susceptible to the morbidity of sepsis syndrome 6.
Appropriate antibiotic coverage is warranted while the patient is thoroughly assessed for infection as the source of the sepsis syndrome, which is common in pancreatic necrosis patients.
Adult critical care stay, sepsis syndrome, and corticosteroid therapy were associated with the greatest risk for death.
* Exclusion of other toxic shock syndromes or other toxic shock-like syndromes, including sepsis syndrome caused by other bacteria, viruses, fungi, or parasites.
Proinflammatory cytokines and sepsis syndrome: not enough, or too much of a good thing?