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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 ?
Nonsustained ventricular tachycardia together with depressed left ventricular ejection fraction (LVEF) was found in only 2.
If "Holtered" for 36 hours, over half would have nonsustained ventricular tachycardia.
Other adverse events reported at a rate of at least 5% during the first 24 hours of infusion with either Natrecor plus standard care or IV nitroglycerin plus standard care therapy, included, respectively: ventricular tachycardia (3%, 5%), nonsustained ventricular tachycardia (3%, 5%), headache (8%, 20%), abdominal pain (1%, 5%), and nausea (4%, 6%).
John Hospital and Medical Center, Detroit, Michigan, performed the world's first Photon(R) Micro implant, implanting a DR model in a 55-year-old male with a history of coronary artery disease, nonsustained ventricular tachycardia (VT), paroxysmal atrial fibrillation (AF), and heart failure (HF).
Their single-chamber, dual-chamber, or biventricular ICDs were programmed to disregard supraventricular tachycardias and slow or nonsustained ventricular tachycardias (VTs) while aggressively expanding preferential use of antitachycardia pacing (ATP) to painlessly terminate fast VTs before resorting to maximum-energy shocks.