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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 ?
Out of 50 patients with narrow complex tachycardia, 28 (56%) patients were of atrioventricular nodal reentry type (AVNRT), 17 (34%) patients were of atrioventricular reentrant tachycardia type (AVRT), 4 (8%) patients were of atrial tachycardia and only one (2%) patient was of atrial fibrillation type.
Removal of paroxysmal atrial tachycardia with oral administration of Digitalis 60C in dogs.
For example, if the RP interval is significantly shorter during ventricular pacing than during tachycardia, the P wave is not likely to be retrograde and the diagnosis is likely to be sinus or ectopic atrial tachycardia.
Lung disease may lead to atrial dilatation and AF, AFL or multifocal atrial tachycardia (MAT).
The P waves of the atrial tachycardia are directed inferiorly.
5,9] Several antiarrhythmic agents were used in an attempt to control our patient's ectopic atrial tachycardia.
In a follow-up period from 90 days to 24 months, recurrence of symptomatic or asymptomatic paroxysmal atrial fibrillation, atrial flutter or atrial tachycardia was detected via intensive heart rhythm monitoring.
In parallel, atrial tachycardia (AT) has become the most common type of arrhythmia after AF ablation, especially after extensive left atrial (LA) substrate modification.
PAROXYSMAL SUPRAVENTRICULAR TACHYCARDIA [PSVT]: PSVT may be caused by Ectopic atrial tachycardia, where an abnormal atrial focus beats at a rate of 160-250bpm or may be caused by reentry in the AV node--AVNRT.