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 ?
In healthy people, "alternans" are usually seen in elevated heart rates of about 110 bpm (beats per minute).
In the Framingham study, unselected patients considered to be free of cardiac disease whose resting heart rate was recorded on entry into the study, an elevated heart rate was associated with significantly increased all-cause, coronary (men only) and cardiovascular mortality (for all groups, with the exception of women > 64 years of age) over a 30-year period (21).
Athletes who train with elevated heart rates for extended periods of time, also known as aerobic training, can experience overtraining as well.
The Wrexham-born rower has been suffering from atrial fibrillation in December and woke with an elevated heart rate.
in which patients with an elevated heart rate of greater than or equal to 75 beats per minute (bpm) showed a significant reduction in the primary composite endpoint (CV death and hospitalisation for worsening heart failure) of 24% (p<0.
In addition, the letter asked for the company to provide evidence that the elevated heart rate associated with the combination does not increase the risk for serious cardiovascular issues.
By contrast, runners who crosstrain--with the hope of substituting a low-impact activity once or more a week but reaping similar fitness gains as running--are wise to focus on sustaining an elevated heart rate to match that caused by running.
He later had an elevated heart rate but is feeling better, according to his daughter, Nan Muehlhausen.
LOS ANGELES - John Wooden will remain hospitalized at least one more day because of an elevated heart rate, the former UCLA coach's daughter said Thursday.
Our research team was largely impressed with the program's ability to maintain a highly elevated heart rate for maximum burning of calories, while still focusing on strength and balance.
Examination showed the collie to be pale and to have a greatly elevated heart rate.
STOCKHOLM - Patients with moderate to severe systolic heart failure and an elevated heart rate had a marked drop in their rate of heart failure death and hospitalization when they were treated with the heart-rate-lowering drug ivabradine in a phase III, randomized trial with more than 6,500 patients.