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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 ?
Evidence to support poor recognition of sepsis syndromes includes lack of adequate fluid boluses for patients who met the definition for hypotension at admission, indicating that clinicians did not recognise the importance of hypotension as a clinical indicator of organ dysfunction in sepsis.
Bearing in mind that during the period from 1995 to 2003 there were 1176 patients with sepsis syndrome in HUV, of which 72% were sepsis and 28% septic shock, of the total of220 patients needed for the study 79 cases and 79 controls were taken with sepsis and 31 cases and 31 controls with septic shock.
Endotoxemia and bacteremia in patients with sepsis syndrome in the intensive care unit.
It's this lipopolysaccharide, also known as endotoxin, that brings about the rapid deterioration characteristic of sepsis syndrome.
Intravenous polyclonal immunoglobulin administration to sepsis syndrome patients: a prospective study in a pediatric intensive care unit.
These mediators produce the major clinical signs and pathophysiological effects in the host that collectively create the sepsis syndrome.
In May 2004, 3 cases of sepsis syndrome in children from the same family were reported to the State Health Secretariat of Bahia in northeastern Brazil.
They should be removed, however, in the presence of inflammation at the catheter site, with signs of the sepsis syndrome, in catheter-related gram-negative bacillary or S.
The chemiluminescent endotoxin assay was significantly higher in patients with gram-negative infection and sepsis syndrome, whereas the LAL assay was not able to discriminate these patient subgroups (Table 1).
Solinex[TM] is in Phase 2 development to determine whether plasma gelsolin replacement therapy can prevent critically ill patients from developing many of the life-threatening complications that appear to be strongly associated with hypogelsolinemia, including acute respiratory distress syndrome (ARDS), severe sepsis syndrome, multiple organ system failure (MOSF) and death.
paragraph]) Besides 9 cases of sepsis syndrome, some of the other case categories were also bacteremic.
The spread of peritonitis, shock due to delay and onset of sepsis syndrome seem to be the main causes for increase in mortality rate.