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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 ?
Our results revealed that SXSM increased heart rate by inhibiting heart parasympathetic transmission based on the decreased CHRNA2 (encodes nicotinic acetylcholine receptor) and increased ACE-1 (encodes acetylcholinesterase) [Table 1].
3) revealing increased heart rate (60 vs 32 [+ or -] 6 bpm), low amplitude of R (0.
Conventional over-the-counter medications to treat asthma include inhalers containing epinephrine, which may result in such negative side effects as increased heart rate and blood pressure, headache, loss of appetite, nausea, nervousness, and tremors.
The side effects of these substances can include severe agitation, paranoia, high blood pressure, increased heart rate and heightened aggression.
Chilli peppers, used in salsa, are also reputed to have aphrodisiac qualities, as eating them generates real physiological responses in our bodies such as sweating, and increased heart rate - similar reactions as people can experience when in the mood for 'lurve'.
There is an increased heart rate and high blood pressure and those addicted to it are more prone to heart attacks and strokes.
The researchers theorized that increased levels of stress hormones, increased heart rate and blood pressure, and impaired immune function associated with noise might lead to stroke.
The findings were based on increased heart rate, blood flow and perspiration and included measuring electrodermal activity, a key component of lie detector tests.
We also don't know for sure whether increased heart rate itself is harmful or whether the increased heart rate is a marker of something else that increases risk, such as inflammation.
Foster (1997) reported increased heart rate in response to caffeine, but she mostly tested lower concentrations than we did, and she only evaluated heart rate immediately after applying the caffeine.
The patient's increased heart rate, shortness of breath, and abnormal EKG should have raised suspicion of an embolism.
The Physician's Desk Reference Guide says increased heart rate and blood pressure can result from using Ritalin, and in August 2001 the Journal of the American Medical Association reiterated that Ritalin acts much like cocaine.

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