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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.
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Adverse events that occurred in [greater than or equal to]2% of patients receiving Xopenex inhalation solution or racemic albuterol and more frequently than patients receiving placebo included flu syndrome, tachycardia or increased heart rate, nervousness, and tremor.
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Potential side effects of therapy with phentermine or sibutramine include primary pulmonary hypertension (associated with phentermine), dry mouth, constipation, insomnia, anxiety; increased blood pressure, and palpitations and increased heart rate.
However, additional stress and increased heart rate causes rapid deterioration of performance.
Less serious side effects could cover dry mouth, insomnia, increased heart rate, constipation, anxiety and feeling jittery.
Marijuana exposures are defined as any situation where an adult or child suffers an adverse reaction to the consumption of marijuana, such as increased heart rate, paranoia or stomach illness, according to the Washington Poison Center.
This was accompanied by increased heart rate and physical sensations in the chest and neck.
Patients with AA suffer with anaemia, fatigue, shortness of breath, an increased heart rate, excessive bleeding and tendency to bruise easily and a higher susceptibility to infection.
Those who have taken the drug have experienced adverse health effects, including increased heart rate, unconsciousness, numbness in legs causing collapse, paranoia, aggression and self-harming.
He added: "The side effects of these substances can include severe agitation, paranoia, high blood pressure, increased heart rate and heightened aggression.

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