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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 ?
Elevated rates of tachysystole and hyperstimulation were not seen in the combination-therapy group perhaps because these patients did not receive as much misoprostol, compared with those in the misoprostol-only group, he speculated.
Concerns about using misoprostol in VBAC patients stems from reports in the literature linking it to complications such as tachysystole, hyperstimulation, and uterine rupture.
Tracing abnormalities induded hypertonus, defined as a single uterine contraction lasting more than 2 minutes, and tachysystole, defined as more than six uterine contractions in a 10-minute window for two consecutive 10-minute windows.
There was no significant difference between groups in the incidence of hyperstimulation syndrome, which was defined as the presence of either hypertonus or tachysystole with fetal bradycardia, tachycardia, and heart rate decelerations, Dr.
Increased rates of tachysystole were seen with vaginal misoprostol, however (26.
However, as expected, tachysystole (defined as five or more contractions in 10 minutes over a 20-minute period) was more common in the misoprostol group (20.
Misoprostol was associated with more tachysystole (16% for oral and 20% for intravaginal administration) than was dinoprostone/oxytocin (2%), but rates of hyperstimulation were similar among the groups: 4%, 7%, and 20/a, respectively.
There were no significant differences between groups in rates of tachysystole, uterine hyperstimulation, or fetal heart rate changes.