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Related to Polymorphic ventricular tachycardia: atrial flutter, Monomorphic ventricular tachycardia


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 ?
Clinical and molecular characterization of patients with catecholaminergic polymorphic ventricular tachycardia.
Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) is an inherited heart rhythm disorder caused by mutations in critical proteins that comprise the calcium release channel (ryanodine receptor) macromolecular complex in the heart.
6) have reported that QT interval above 600 ms and premature ventricular beats on electrocardiogram (ECG) seem to indicate an increased risk for the development of polymorphic ventricular tachycardia in a patient with atrioventricular block (AVB) (6).
As with other antiarrhythmic agents used to treat atrial fibrillation and flutter, a potentially life-threatening side effect associated with Corvert is the development in a small number of patients of sustained polymorphic ventricular tachycardia (PVT), an arrhythmia of the ventricles.

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