How are entities that involve wide-QRS supraventricular tachycardia (SVT) distinguished in the differential diagnosis of Wolff-Parkinson-White (WPW) syndrome?

Updated: Jan 08, 2017
  • Author: Christopher R Ellis, MD, FACC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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Answer

Entities that involve wide-QRS SVT must be differentiated from ventricular tachycardia (VT). Examples include the following:

  • Aberrantly conducting orthodromic SVT, which is wide-QRS SVT with the AV node as the antegrade limb but with bundle branch block, must be differentiated from VT
  • Antidromic tachycardia, which is wide-QRS SVT due to ventricular preexcitation through an AP, must also be differentiated from VT and from Mahaim fiber tachycardia

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