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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 ?
of Cases 1 Sinus tachycardia 45 2 P Wave Abnormality- Tall & Peaked P waves- 24 16 P wave axis RAD 3 Q waves in inferior leads 3 4 ST depression in inferior and lateral leads 16 5 T wave inversion in Inferior and Lateral leads 9 6 Poor Progression of R waves 16 7 U waves 4 8 Right Bundle branch block 1 9 Arrhythmias -atrial ectopics / ventricular 5 ectopics 10 No other changes except sinus tachycardia 5 SI.
ECG showed sinus tachycardia with non-specific ST-T changes suggesting myocarditis.
Sinus Tachycardia: Sinus tachycardia indicates a sinus rhythm above lOObpm.
These data allows to detect AF, atrial flutter, sinus tachycardia and other SVT with 1:1 conduction.
Electrocardiographic changes in our study showed 37% with sinus bradycardia, 48% with normal sinus rhythm, 1% with first degree heart block, and 14% with sinus tachycardia.
During the clinical follow-up parenteral diltiazem was also given because of the short term sinus tachycardia.
The most common cardiovascular manifestation is sinus tachycardia, often associated with palpitations, occasionally caused by supraventricular tachycardia.
An electrocardiogram (ECG) on presentation revealed sinus tachycardia with poor R wave progression in precordial leads and ST-segment elevation in leads V4 through V6, mimicking acute myocardial infarction [Figure 1].
Figure-1B) During interrogation of the device, there was p-wave oversensing during sinus tachycardia by the ICD lead.