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ECG findings in re-entrant tachycardias

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The rhythm is regular and the rate is between 130 and 250 beats per minute.

The QRS complex is narrow unless:

  • there is rate-related bundle branch block
  • there is pre-existing bundle branch block
  • anterograde conduction occurs down an accessory pathway which is distinct from the AV node

P waves:

  • are inverted
  • in AV-nodal re-entry tachycardia may be masked by the QRS complex
  • in AV re-entry tachycardia occur half-way between the QRS complexes
  • there is one P wave for each QRS complex

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