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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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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Excessive rapidity of the heart's action.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Distribution of Cases According to Maternal Complications Group - A Group - B Maternal Complications (Oral) (Vaginal) n (%) n (%) Uterine Tachysystole 0 0.0% 1 2.9% Nil 33 100.0% 34 99.1% Total 33 100.0% 35 100.0% Table 11.
In BJOG in 2004 it was shown oral 100gm of dose at four hourly intervals was cheap and effective alternative to vaginal Prostaglandin E2 tablets and not associated with significant hyper stimulation and tachysystole producing similar maternal and neonatal outcomes22, these re sults are confirmed by our study that oral 100 gm of oral misoprostol is a safe and economical alternative to prostaglandin vaginal tablets and the results in our study show similar outcomes without any significant differences in the two groups regarding the cervical score, the induction to delivery time, the number of patients delivering vaginally, the caesarean rates and the neonatal outcomes.
After 6 hours, she develops uterine tachysystole with recurrent variable decelerations but the oxytocin infusion is continued at the same rate (FIGURE 6).
Uterine contractions were monitored to detect hyper stimulation and tachysystole. Pelvic examination was mandatory before repeating the dose.
Over the years, I have seen a reluctance to appropriately utilize pitocin to remedy soft-tissue dystocias due to over reliance/interpretation of fetal heart tracings, including nonsignificant "tachysystole." While on the one hand we know the very low positive predictive value of a "nonreassuring" tracing, the clinician seems constrained to perform a cesarean rather than risk any second-guessing should a less-than-an-ideal outcome be the case.
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: 4%, 7%, and 2%, respectively.
Both the groups were given antibiotics like ampicillin/amoxicillin and were monitored for foetal distress, tachysystole, hyperstimulation and progress of labour.
When clear definitions of abnormal heart-rate patterns and tachysystole are addressed through Specific interventions, according to this prospective, nonrandomized study of 14,398 women undergoing induction of labor with oxytocin.
Hyperstimulation was defined as tachysystole (at least 6 contractions in 10 minutes) or prolonged uterine contractions > 2 minutes accompanied by abnormal fetal heart rate tracing.
Depending on the clinical situation, efforts to resolve the abnormal pattern include (but are not limited to) provision of maternal oxygen, change in maternal position, discontinuation of labor stimulation, treatment of maternal hypotension, and treatment of tachysystole with FHR changes.
In the Misoprostol group, the present study says there is an increased incidence of tachysystole 4% and hyperstimulation 6%.