Junctional tachycardia

Junctional tachycardia
ECG showing junctional tachycardia. Narrow complex QRS. No P waves. Heart rate fast.
Classification and external resources
ICD-10 I47.1
ICD-9-CM xxx

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 junctional tachycardia implies a rate >60 bpm.

Junctional tachycardia (rate about 115/min) dissociated from a slightly slower sinus tachycardia (rate about 107/min) producing one form of double tachycardia; pairs of ventricular capture (C) beats (5th, 6th, 19th, and 20th beats); see laddergram.

Cause

It can be associated with digitalis toxicity.[3] It may be also be due to onset of acute coronary syndrome, heart failure, conduction system diseases with enhanced automaticity, or administration of theophylline.[4]

Diagnosis

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. Junctional Tachycardia can appear similar to atrioventricular nodal reentrant tachycardia.[5]

One form is junctional ectopic tachycardia.

See also

References

  1. ↑ "junctional tachycardia" at Dorland's Medical Dictionary
  2. 1 2 ROSEN, KENNETH (1973). "Junctional Tachycardia: Mechanisms, Diagnosis, Differential Diagnosis, and Management" (PDF). Circulation: 654–664. doi:10.1161/01.CIR.47.3.654. Retrieved March 1, 2015.
  3. ↑ "Junctional Rhythm: Overview - eMedicine". Retrieved 2008-12-21.
  4. ↑ Aehlert, Barbara (2013). ECGs Made Easy (5th ed.). Elsevier. p. 160. ISBN 9780323170574.
  5. ↑ Srivathsan K, Gami AS, Barrett R, Monahan K, Packer DL, Asirvatham SJ (January 2008). "Differentiating atrioventricular nodal reentrant tachycardia from junctional tachycardia: novel application of the delta H-A interval". J. Cardiovasc. Electrophysiol. 19 (1): 1–6. doi:10.1111/j.1540-8167.2007.00961.x. PMID 17916156.


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