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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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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.


Excessive rapidity of the heart's action.
References in periodicals archive ?
Company, which is turn is wholly owned by the Abu Dhabi Government, is reportedly fully supportive of the original Arabtec Au WCT action.
WCT Resources and SandRidge shared an address until last year;
Michael Smyth, General Manager of TransPerfect Life Sciences Solutions, added, "We are proud that WCT has chosen Trial Interactive as its eTMF solution, and we're pleased to support their ultimate goal of a paperless clinical trial.
The Paradigm is a 70:30 joint venture with national social security provider Employees Provident Fund, a substantial shareholder of WCT with a current 21 per cent equity interest in WCT, up from 14 per cent since MARC's last review.
WCT, which specialises in building F1 tracks, had won the Abu Dhabi contract last July.
According to the information, WCT Bhd has won the work package V204 to construct and complete the viaduct guideway and other associated works from Bandar Malaysia South Portal to Kampung Muhibbah worth RM896.
Billed as "the largest commercial capacity district cooling chiller in the world" the WCT 6000 is expected to find a huge market across the MENA region.
CURLING: Hammy McMillan won through to the semi-finals of the WCT Series Tournament in Montreal before losing 5-4 to the Kerry Burtnyk rink from Winnipeg.
RELATED ARTICLES: Meydan sues arbitration panel in Arabtec/WCT case l WCT JV wins $320m Batinah Expressway contract l Meydan launches $952.
A joint venture (JV) between Malaysia's WCT Berhad and Oman Roads Engineering Company has secured the $320m Al Batinah Expressway package 2 contract.
ii) Attested copy of WCT along with end user certificate should be enclosed for the above executed order.
The WCT enables wireless service providers to easily test the coverage of Wavion's WBS-2400 base stations in their actual locations.