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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 ?
Despite the P-wave morphology on surface ECG pointing to a focal atrial tachycardia, electroanatomic mapping confirmed MAT.
Our case demonstrates that three-dimensional mapping systems help significantly in the mapping and ablation of focal and multifocal atrial tachycardia besides their advantage of reduced radiation exposure for the patients and catheterization laboratory personnel.
Sites of earliest activation were determined for basal sinus beats, for atrial escape beats and atrial tachycardia beats.
During the successful treatment of a patient with an atrial tachycardia, we were able to precisely and easily adjust the tip of the Celsius RMT Diagnostic and Ablation Catheter using computer control.
Both the Accent pacemaker and the Anthem CRT-P will also allow physicians to monitor and be alerted when their patients with these devices are experiencing atrial fibrillation or atrial tachycardia.
In addition to minimizing right ventricular pacing, the new EnRhythm pacemaker has reactive anti-tachycardia pacing, which continually searches for new opportunities to restore a patient's normal sinus rhythm during long atrial tachycardia episodes.
Procainamide HCl is a cardiovascular prescription drug used to treat life-threatening ventricular arrythmias, atrial fibrillation, and paroxysmal atrial tachycardia.
Pace-termination therapies that stop atrial episodes and restore sinus rhythm - The pace-termination capabilities recognize atrial tachycardia episodes and can deliver three forms of pace-termination therapies to painlessly and quickly end them, thus restoring sinus rhythm and potentially eliminating the need for cardioversion.
Auto Mode Switching -- Trilogy(TM) DR+ rapidly responds to atrial tachycardia by automatically switching pacing modes from DDD(R) to DDI(R).