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Related to nonsustained ventricular tachycardia: Vtach


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 ?
Keywords: nonsustained ventricular tachycardia, Holter electrocardiography, coronary heart disease, dilated cardiomyopathy, hypertrophic cardiomyopathy, sudden death, arrhythmia
13] In patients with high-frequency ectopic depolarizations and episodes of nonsustained ventricular tachycardia, flecainide has produced more than 80% suppression of arrhythmia and virtual abolition of complex forms in approximately 90% of patients (while generally preserving left ventricular performance).
That study showed that sleep-disordered breathing was associated with four times the odds of atrial fibrillation, three times the odds of nonsustained ventricular tachycardia, and almost twice the odds of complex ventricular ectopy, after adjustment of the data for age, sex, body mass index, and prevalent coronary heart disease.
Patients in the study, aged 21-to-80 years, have non-ischemic cardiomyopathy with a low left ventricular ejection fraction (LVEF), history of symptomatic heart failure (HF), and documented nonsustained ventricular tachycardia (VT).