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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 ?
Total time required to complete radiofrequency catheter ablation procedure is quite variable in various studies, but there is a general trend of shorter procedural duration for AVNRT as compared to AVRT15.
2006) documented pain syndrome in patients with AVNRT who in addition to cardiac arrhythmia syndrome suffered IHD, hypertensive disease and degenerative disk disorder with radicular syndrome.
We have managed to establish that in patients with AVNRT reduction in QoL parameters took place predominantly due to changes in the physical component than to those in the mental one (38.
In general, if the RP interval is <70 ms, the arrhythmia is usually due to typical AVNRT.
30,31) ST depression of more than 2 mm or T wave inversion is more common in AVRT than in AVNRT.
Although the safety and effectiveness in a multicenter study presented at the meeting were not as good as those expected for radiofrequency (RF) ablation, panel members voting in favor agreed that the results "provided a reasonable assurance" that the device was safe and effective for patients with AVNRT.
The Freezor device was used to treat adults with AVNRT, atrioventricular reciprocating tachycardia (AVRT), or atrial fibrillation (AF), in a single-arm, nonrandomized study at 14 U.