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 ?
Her nonstress tests were all reactive with no evidence of fetal tachycardia or abnormal decelerations.
Fetal tachycardia is the most common side effect of beta-adrenergic receptor agonists.
80 C) plus at least two of the following conditions: maternal or fetal tachycardia, uterine tenderness, foul odor of amniotic fluid, and maternal leukocytosis.
80 C), which was seen in 24% of patients; fundal tenderness (62%); fetal tachycardia above 160 beats/minute (10%); and leukocytosis above 15,000 m[m.
An early warning sign of this is fetal tachycardia in the second stage of labor.
Fetal tachycardia was present so emergency caesarean section was performed (1).
Fetal tachycardia was strongly associated with fetal acidemia and adverse neonatal outcomes in both groups.
Fetal heart abnormalities were seen in 11 cases (23%) of which fetal tachycardia was seen more often than bradycardia.
are euthyroid or have undergone ablative therapy and have fetal tachycardia or intrauterine growth restriction
Indicators of uterine infection included clinical chorioamnionitis; a maternal temperature above 37[degrees]C; acute placental inflammation; placental-fetal inflammation; maternal fever and at least two of the following clinical findings: fetal tachycardia, white blood count below 15,000, or a foul vaginal discharge.
Identify indicators of infection, such as maternal fever and tachycardia, fundal tenderness, fetal tachycardia, and an elevated white blood cell count