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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 ?
Difference between supine and upright blood pressure associates to the efficacy of midodrine on postural orthostatic tachycardia syndrome (POTS) in children.
Hibbard suffered from Postural Orthostatic Tachycardia Syndrome ("POTS"), a limited form of autonomic neuropathy.
Disruption of normal autonomic function may manifest as one of a heterogeneous group of clinical disorders collectively referred to as postural orthostatic tachycardia syndrome.
Flow-mediated vasodilation and endothelium function in children with postural orthostatic tachycardia syndrome.
Autoimmunoreactive IgGs from patients with postural orthostatic tachycardia syndrome.
A program of regular exercise proved superior to beta blockers in treating and even curing an unusual heart condition called Postural Orthostatic Tachycardia Syndrome (POTS).
Postural Orthostatic Tachycardia Syndrome (POTS) is called 'The Grinch Syndrome' because most patients have a heart that's 'two sizes too small'.
Five also experienced syncope, seven near-syncope, and five had orthostatic tachycardia.
Five also experienced syncope, seven had near-syncope, and five had orthostatic tachycardia.
In some cohorts, there is postural orthostatic tachycardia syndrome (POTS) or orthostatic hypotension (OH), and in addition to autonomic dysfunction, there is also evidence of endocrine or cardiac involvement and possibly a genetic predisposition.
Jackie has postural orthostatic tachycardia syndrome, which means when her heart rate rises, her blood pressure drops, and she blacks out.