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Wide complex tachycardia
An arrhythmia with a sustained rate of more than 100 bpm in which the surface electrocardiogram reveals QRS complexes lasting at least 120 msec. WCT is usually caused by ventricular tachycardia, although it may occasionally result from a supraventricular tachycardia whose conduction through the ventricles produces an abnormally wide QRS complex.
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Reflex tachycardia
Tachycardia resulting from stimuli outside the heart, reflexly accelerating the heart rate or depressing vagal tone.
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Paroxysmal ventricular tachycardia
Ventricular tachycardia beginning and ending suddenly. A swift, irregular heartbeat originating in the ventricle. A fast heart rhythm originating in the ventricle.
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Paroxysmal junctional tachycardia
Tachycardia due to increased activity of the AV junction. The rate is usually from 120 to 180 bpm.
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Pacemaker-mediated tachycardia
A problem of dual-chamber cardiac pacemakers in which tachycardia develops due to improper functioning of the pacemaker. This can be treated by reprogramming the electronic signals to the atrium.
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Narrow complex tachycardia
Tachycardia in which the duration of the QRS complex is less than 0.12 seconds. Most narrow complex tachycardias originate from a pacemaker above the ventricles and are therefore supraventricular tachycardias.
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Multifocal atrial tachycardia
A cardiac arrhythmia that sometimes is confused with atrial fibrillation, because the heart rate is greater than 100 bpm and the ventricular response is irregular. However, in MAT P waves are clearly visible on the electrocardiogram, and they have at least three distinct shapes. MAT is seen most often in patients with poorly compensated chronic…
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Fetal tachycardia
A fetal heart rate faster than 160 bpm that persists throughout one 10-min period.
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Ectopic tachycardia
A rapid heartbeat caused by stimuli arising from outside the sinoatrial node.
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Atrioventricular nodal reentrant tachycardia
The most common supraventricular tachycardia, resulting from abnormal conduction of electrical impulses through a self-sustaining circuit in the atrioventricular node. It occurs more often in women than in men, often in their twenties. The heart rate is usually between 150 and 250 bpm.
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