From ECGpedia
Revision as of 19:36, 22 July 2007 by Drj (talk | contribs) (New page: {{Chapter|Supraventricular Rhythms}} {{Arrhythmias| | name = AV Nodal Re-entry Tachycardia (AVNRT) | locatieImage = | atrial_frequency = 180-250 bpm | ventricular_frequency = 180-250 bpm ...)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
This is part of: Supraventricular Rhythms
AV Nodal Re-entry Tachycardia (AVNRT)
Atrial rate 180-250 bpm
Ventricular rate 180-250 bpm
Regularity regular
Origin AV node
P-wave inside or right after the QRS complex
Effect of adenosine terminates the arrhythmia(!)
Example ECG: The first part of this example shows AVNRT. After injection of adenosine, the arrhythmia terminates. AV Nodal Re-entry Tachycardia (AVNRT) terminated by adenosine injection
Example ECG2: AV Nodal Re-entry Tachycardia (AVNRT)

An AV Nodal Re-entry Tachycardia (AVNRT) is a rapid tachycardia with a typical frequency around 200 bpm. The tachycardia origin is the AV node. A prerequisite for AVNRT is a slow and fast pathway in the AV node, most often caused by degradation of the AV nodular tissue. The dual pathways facilitate re-entry.

Two sensitive characteristics to identify AVNRT on the ECG are:

  • R'. This is a small secondary R wave. It resembles a right bundel branch block, but the QRS width stays < 120ms.
  • RP << 100ms. The distance between the R and P waves is less than 100ms.