tachycardia


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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 ?
The RVOT aneurysm is one of the rare causes of the outflow tract tachycardia. The CMRI has become the ideal method for an anatomic evaluation of the RVOT and for diagnosis of abnormalities from this challenging field.
In cases of difficulty in the induction of SVT, intravenous (IV) doses of atropine or infusion of dobutamine were used in addition to pacing protocols to facilitate tachycardia induction.
Rate control by transoesophageal atrial overdrive pacing for refractory supraventricular tachycardia with severe ventricular dysfunction: A bridge to recovery.
Autonomic nervous system modulation before the onset of sustained atrioventricular nodal reentry tachycardia. Ann Noninvasive Electrocardiol 2010;15:49-55.
A mutation in the RyR2 gene is present in approximately 60% of patients with catecholaminergic polymorphic ventricular tachycardia (1).
Adamec, "Postural orthostatic tachycardia predicts early conversion to multiple sclerosis after clinically isolated syndrome," European Neurology, vol.
(ii) Troponin leak in the setting of tachycardia is expected, yet further evaluation should be sought on individualised bases
described the capacity of deep inspiration and dependent body position to terminate tachycardia in 11 patients with recurrent PSVT.
Cuculich, MD, an associate professor of medicine, was looking for new ways to treat ventricular tachycardia in patients who did not respond to conventional treatments.
The value of the electroacardiogram in the differential diagnosis of a tachycardia with a widened QRS compex.
Here we report the case of a patient with wide QRS complex tachycardia who was admitted to the emergency unit and diagnosed with runaway pacemaker.