What are the limitations of stress testing in the 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

If preexcitation is abruptly lost, stress testing may reveal the refractory periods of APs in patients with WPW syndrome. Such testing may be unreliable, however, because exercise also alters the competing conduction properties of the atrioventricular (AV) node and will favor conduction over the AV node if a septal or left-side AP is present.


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