tachycardia

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tachycardia:

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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Tachycardia

 

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.

tachycardia

[¦tak·ə¦kärd·ē·ə]
(medicine)
Excessive rapidity of the heart's action.
References in periodicals archive ?
Our results revealed that SXSM increased heart rate by inhibiting heart parasympathetic transmission based on the decreased CHRNA2 (encodes nicotinic acetylcholine receptor) and increased ACE-1 (encodes acetylcholinesterase) [Table 1].
3) revealing increased heart rate (60 vs 32 [+ or -] 6 bpm), low amplitude of R (0.
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Foster (1997) reported increased heart rate in response to caffeine, but she mostly tested lower concentrations than we did, and she only evaluated heart rate immediately after applying the caffeine.
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