How is antidromic tachycardia characterized on ECG in 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

On ECG, the QRS is wide, reflecting an exaggeration of the delta wave during sinus rhythm (ie, wide-QRS tachycardia). Such tachycardias are difficult to differentiate from ventricular tachycardias and often have a slurred R wave upstroke with QRS duration longer than 160 ms.


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