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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 ?
The basis for the latest reaction is MeydanAAEs claim that Arabtec WCT joint venture arbitration has expired.
WCT Resources is owned by trusts established by Tom and Sch'ree Ward and whose trustee is a SandRidge employee;
TPG-Axon goes to great lengths to establish that WCT Resources owns leasehold acreage adjacent to acreage held by the Company.
To date there has only been silence, other than the assertion, which we believe lacks credibility, that Tom Ward had no involvement in WCT.
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.
According to WCT Holdings, on Monday it received the letter of award from Petronas subsidiary PRPC Utilities and Facilities Sdn Bhd for the Utilities, Interconnecting and Offsite (UIO) Facilities: PCC of Civil & Infrastructure Works at Petchem Interconnecting and 6900 Area (Package 14-0302); and PCC of Civil & Infrastructure Works at Petchem Interconnecting South Area (Package 14-0303).
Francois Boueri, President of Daikin McQuay Middle East, said: " WCT chillers represent the most recent product in a long line of innovative solution from Daikin McQuay seeing that they are considered experts in delivering cooling systems across the Middle East.
Evidence at trial showed that the fake files purchased by WCT were created by non-enrolled, and in many cases, non-licensed contractor therapists.
WCT and Arabtec were initiating a civil suit and arbitration proceedings against Dubai's Meydan over an alleged 'breach of contract' for cancelling the deal to build a racecourse in Dubai, WCT said.
After missing several years on the tour in the mid-'90s after an emotional breakdown, he came back for the 1997 season and he finished second in what the WCT called ``the greatest comeback in surf history.
The shares of WCT Holdings Bhd on Bursa Malaysia has been increased after the award of a RM267 million deal for earth and infrastructure works at the Petronas Refinery and Petrochemical Integrated Development (RAPID) project.
RELATED ARTICLES: Meydan sues arbitration panel in Arabtec/WCT case l WCT JV wins $320m Batinah Expressway contract l Meydan launches $952.