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Junctional tachycardia
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Junctional tachycardia

Contributors: Navya Akula MD, Varda Singhal MD, Ryan Hoefen MD, PhD
Other Resources UpToDate PubMed


Junctional tachycardia (JT), or junctional ectopic tachycardia (JET), is a rapid, narrow complex tachycardia (usually 120-220 bpm) arising from a discrete focus within the atrioventricular (AV) node or His bundle. It may be regular or irregular.

The mechanism of action for JT usually involves increased automaticity in the AV node.

JT is typically seen in children and young adults. It is also seen in infants postoperatively after repair of congenital heart disease. It is usually highly symptomatic. It may result in heart failure in cases where tachycardia is incessant.

In adults, JT is less common, although it is sometimes seen in the setting of digoxin toxicity, myocardial infarction (MI), myocarditis, or cardiac surgery. It is usually benign in adults.


I47.1 – Supraventricular tachycardia

419166005 – Junctional ectopic tachycardia

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

  • Atrioventricular nodal reentry tachycardia (AVNRT)
  • Atrioventricular reentry tachycardia (AVRT)
  • Atrial flutter
  • Atrial fibrillation
  • Atrial tachycardia
  • Sinus tachycardia
  • Ventricular tachycardia
  • Wolff-Parkinson-White pattern
  • Hyperthyroidism

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Last Reviewed:01/03/2021
Last Updated:01/04/2021
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Junctional tachycardia
A medical illustration showing key findings of Junctional tachycardia : Tachycardia
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