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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 ?
Sinus tachycardia (Figure 5A) is the most common form of tachycardia and can be difficult to diagnose, particularly when there is an associated first-degree AV block.
A case report by Chun and Godfrey showed right atrium dilation with diffuse atrial hemorrhage, interstitial edema, and vascular congestion without surrounding myocardial fibers and conduction system involvement in a 19-year-old soldier who died from epidemic (Korean) hemorrhagic fever, sinus tachycardia, paroxysmal supraventricular tachycardia, and congestive heart failure (8).
Cigarette smoking is implicated in a wide spectrum of cardiac rhythm disorders, including transient sinus arrest and/or bradycardia, sinus tachycardia, atrial fibrillation, sinoatrial block, AV block, and ventricular tachyarrhythmias (2, 3, 5, 6).
Electrocardiography showed sinus tachycardia and left ventricular hypertrophy with a strain pattern.
The specific TEAEs, which occurred at a rate of greater than or equal to 5%, were headache, akathisia, extrapyramidal disorder, sedation, insomnia, agitation, anxiety, tachycardia and sinus tachycardia for paliperidone ER, and headache, sedation, insomnia, agitation and anxiety for placebo.
The package insert for amitriptyline advises doctors to carefully monitor patients with cardiovascular disorders and notes that the drug can cause cardiac arrhythmias, sinus tachycardia, myocardial infarction, stroke, and both high and low blood sugar.
An electrocardiogram 11 months earlier had been normal except for sinus tachycardia, but in addition to sinus tachycardia the electrocardiogram recorded soon after the current admission showed changes suggestive of severe hypokalemia (Figure 1): sagging ST segments, low T waves, and prominent U waves (which because of the tachycardia fuse with the subsequent P waves).
Electrocardiogram showed sinus tachycardia with nonspecific ST-T wave changes.
The treatment of inappropriate sinus tachycardia is primarily symptom based: [beta]-blockers are recommended as first-line treatment.
Cyclobenzaprine is closely related to the tricyclic antidepressants, which have been reported to produce arrhythmias, sinus tachycardia, prolongation of the conduction time leading to myocardial infarction, and stroke.