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SVT with Aberrancy



  • 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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