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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 ?
There's currently no cure but CMT UK is fundraising and campaigning for continuing research, in the hope of improving understanding and potential treatments.
CMT International, Inc is a US Sales office offering a complete range of quality IP Network cameras and video servers.
Karen Butcher, from CMT United Kingdom, said: "In many ways CMT is a secret condition, it's never spoken about and few people know that it even exists.
As Commander of the CMT, Behroozian has the power to utilise resources from all RTA agencies.
The macroscopic image of these joints reveal the formation of heat affected zones in the base materials, extended in the case of CMT joint samples number 1 and 4, compared to the other samples.
Rather than reexamine fundamental choices, CMT leaders viewed their struggles as minor setbacks, and they simply urged their team to work harder to get back to plan.
CMT disorders are sometimes referred to as hereditary motor and sensory neuropathies (HMSNs).
They are suing CMT Blues, the garment labels that subcontracted the T-shirt manufacturer, Donovan's warden, other prison officials, and the California Department of Corrections for labor law violations, civil rights violations, and fraud.
On incendiarism see below and, for example, (Umtata) CMT 164, Rex v.
Under the agreement, CMT and Premiere Networks will continue to collaborate and develop programs and events for multiple platforms and screens that give fans insider access to the artists and music they love.
CMT Materials is the acknowledged leader in the design and development of syntactic foams for use as plug-assist materials.
As a first step in the partnership, 5miles has integrated CMT into the latest version of its app.