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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 ?
In the study, seven patients--three with AVNRT and four with AVRT--experienced eight acute major complications within 7 days of the procedure, for a major complication rate of 4.
He also described the clinical scenario of a 20-year-old patient with AVNRT, who has a choice between RE ablation with a 94% chance of success but some risk of ending up with a pacemaker, versus cryoablation with a 91% chance of acute success with no chance of ending up with a pacemaker.
In this series of patients undergoing slow pathway ablation to eliminate AVNRT, a combined anatomic and electrogram mapping approach was used and a successful outcome was achieved in all patients.
It appears in 75-92% of all AVNRT ablation attempts (5,7).
AVNRT procedures have a well documented incidence of causing up to 2% unintentional permanent AV block - a devastating complication that is often worse than the problem being treated and is the leading cause of litigation against electrophysiologists.