When does an ECG appear normal 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

In other WPW syndrome cases, arrival of the electrical impulse to the ventricle occurs nearly simultaneously through both the accessory pathway and the AV node. When this occurs, preexcitation is absent, and ECG appears normal. Thus, ECG morphology depends directly on the degree of preexcitation (ie, relative conduction speeds).


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