Which ECG findings suggest orthodromic tachycardia 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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During orthodromic tachycardia, a narrow complex QRS is evident, with the P wave often detectable as a subtle deflection within the T wave. During antidromic tachycardia, a wide complex QRS is seen and may not be distinguishable from VT (in which case it must be treated as such).

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