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 heart rate is an integrated index of autonomic cardiovascular function and elevated heart rate values indicate adrenergic overdrive, leading to / or worsening ischemia with risk of acute coronary syndromes (ACS), fatal or non-fatal arrhythmias or heart failure.
This finding, however, does not preclude the possibility of pollution-related effects on TWA at elevated heart rates, such as during exercise, or the possibility of delayed responses.
But a Sunday Mirror investigation has revealed that side-effects include a risk of low blood pressure and an elevated heart rate - conditions which in extreme circumstances can lead to heart failure and permanent brain damage.
An elevated heart rate at night can lead to feelings of restlessness," The New York Daily News quoted Monica Vazquez, master trainer from New York Sports Clubs, as saying.
Based on this study, we believe that an elevated heart rate seen over a number of years is worrisome, signifying that these patients need further evaluation to see what might be causing the high heart rate," he added.
Atropine inhibits nerves and is often used to treat Parkinson's, dilate pupils and maintain an elevated heart rate.
The big dangers are elevated heart rate and blood pressure in this situation.
You may keep an elevated heart rate of, say, 120 bpm in between repeats in the case of the lesser effort workouts, but if you are exerting 95% of maximal effort, it's best to let the heart come down to below 96 bpm in between.
An elevated heart rate was also an independent predictor of noncardiovascular mortality in men and women (16-18).
And in all candor, these fumble-fingered leather devices were slow in application, especially in the dark and with an elevated heart rate.
SYMPTOM Elevated heart rate and loss of feeling in the legs.
The presence of alternans is relied on elevated heart rate (HR), and the methods of HR increase are stress test or atrial pacing.