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Abnormally fast heartbeat, the cause of which involves the atrioventricular node From Wikipedia, the free encyclopedia
Junctional tachycardia is a form of supraventricular tachycardia characterized by involvement of the AV node.[1] It can be contrasted to atrial tachycardia. It is a tachycardia associated with the generation of impulses in a focus in the region of the atrioventricular node due to an A-V disassociation.[2] In general, the AV junction's intrinsic rate is 40-60 bpm so an accelerated junctional rhythm is from 60-100bpm and then becomes junctional tachycardia at a rate of >100 bpm.
It can be associated with digitalis toxicity.[3] It may also be due to onset of acute coronary syndrome, heart failure, conduction system diseases with enhanced automaticity, or administration of theophylline.[4]
On an EKG, junctional tachycardia exhibits the following classic criteria:[2]
It can coexist with other superventricular tachycardias due to the disassociation between the SA node and the AV node. [citation needed]
Forms of junctional tachycardia include junctional ectopic tachycardia (JET) and atrioventricular nodal re-entrant tachycardia (AVNRT) which can be distinguished by performing electrophysiological studies.[5]
Amiodarone is used to control the rhythm. Electrical cardioversion is not used.[citation needed]
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