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Tachyarrhythmias
 
 

SVT with Aberrancy

 
 
 
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Overview

Supraventricular tachycardias in the presence of either bundle branch block or pre-excitation (accessory pathway) will present with a regular wide complex tachycardia that is often difficult to distinguish from ventricular tachycardia.
  • Look For

  • Heart rate 100-250bpm
  • Regular rhythm
  • Broad QRS complex >120ms
  • On Old ECGs

  • Bundle branch block
  • Wolff-Parkinson-White pattern
  • Examples

  • SVT with left bundle branch block:
  • SVT with left bundle branch block
  • SVT with right bundle branch block:
  • SVT with right bundle branch block
To find out how to distinguish SVT with aberrancy from VT, read the section called ‘distinguishing VT and SVT with aberrancy'.
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