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Junctional tachycardia
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Junctional tachycardia

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Contributors: Varda Singhal MD, Ryan Hoefen MD, PhD
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Synopsis

Junctional tachycardia (JT), or junctional ectopic tachycardia (JET), is a narrow complex tachycardia arising from a discrete focus within the atrioventricular (AV) node or His bundle. On ECG, retrograde P waves usually appear after or sometimes within the QRS complex.

Paroxysmal (or "focal") JT:
  • Uncommon in pediatric populations and even less common in adults. It most often occurs in young adults in association with exercise or stress but may occur congenitally or postoperatively. It may be found in patients with structurally normal hearts or in patients with congenital cardiac abnormalities.
  • Patients are often quite symptomatic and, if untreated, may develop heart failure, particularly if tachycardia is incessant.
  • Usually responds to beta blockers or intravenous flecainide. Catheter ablation may be curative, although there is a 5%-10% risk of AV block.
Nonparoxysmal JT:

Codes

ICD10CM:
I47.1  – Supraventricular tachycardia

SNOMEDCT:
419166005  – Junctional ectopic tachycardia

Differential Diagnosis & Pitfalls

Best Tests

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References

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Last Updated: 01/31/2017
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Junctional tachycardia
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Junctional tachycardia : Arrhythmia, HR increased
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