This site is intended for healthcare professionals

CPD
CPD
Pro
Pro
Sign in
Go to /sign-in page

You can view 5 more pages before signing in

Go to /pro/cpd-dashboard page

This page is worth 0.05 CPD credits. CPD dashboard

Go to /account/subscription-details page

This page is worth 0.05 CPD credits. Upgrade to Pro

ECG findings in re-entrant tachycardias

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

Create an account to add page annotations

Create a free account

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2025 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.