tachycardia

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Related to sustained ventricular tachycardia: nonsustained ventricular tachycardia

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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Tachycardia

 

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.

tachycardia

[¦tak·ə¦kärd·ē·ə]
(medicine)
Excessive rapidity of the heart's action.
References in periodicals archive ?
Radiofrequency ablation of sustained ventricular tachycardia related to the mitral isthmus in Chagas' disease.
11-13] The incidence approaches 20% in patients with severe ventricular dysfunction and a previous history of sustained ventricular tachycardia who are taking more than 400 mg of the drug daily; moreover, in about 10%, the proarrhythmic events were fatal.
Methods: We performed a singular value decomposition of repolarization potentials in individual recordings in 134 healthy males, in 203 males with old MI and without documented sustained ventricular tachycardia (VT) and in 104 MI males with documented VT.
The expanded ICD coverage includes two more categories of patients--those with coronary artery disease with prior myocardial infarction, left ventricular ejection fraction [less than or equal to] 35%, and inducible, sustained ventricular tachycardia or ventricular fibrillation at electrophysiological study; and those with a prior myocardial infarction and left ventricular ejection fraction [less than or equal to] 30% and a QRS duration of greater than 120 milliseconds.
Objective: We present the improved method of recognition of sustained ventricular tachycardia (SVT) based on new filtering technique (FIR), extended signal-averaged electrocardiography (SAECG) description by 9 parameters and the application of support vector machine (SVM) classifier.
Reading between the lines, his doctors performed an electrophysiologic study in which they stimulated his heart and may or may not have produced sustained ventricular tachycardia and fibrillation.
During follow-up, 25 patients reached one of the prospectively defined end points (primary composite end point of cardiac death, sustained ventricular tachycardia or resuscitated ventricular fibrillation; secondary end point: arrhythmic events).
Eigenvector analysis was applied to QRST integral maps of 2 groups of patients with old myocardial infarction (11 patients with episodes of sustained ventricular tachycardia and 62 without arrhythmias) and in a control group of healthy subjects (3).
In patients who have experienced SCD or sustained ventricular tachycardia, the judgment to implant an ICD for secondary prevention is straightforward because of subsequently high annual rates of recurrent malignant arrhythmia.
However heart failure due to atrial fibrillation and left ventricular aneurysm have prognostic importance (7); aneurysm can be complicated by sustained ventricular tachycardia in some patients (12,13) Implantable defibrillators may be considered in patients with ventricular tachycardia or with massive hypertrophy (14).