What are the most common accessory pathways involved in Wolff-Parkinson-White (WPW) syndrome in the US?

Updated: Jan 08, 2017
  • Author: Christopher R Ellis, MD, FACC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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The location of the accessory pathways (APs), in descending order of frequency, is (1) 53%, the left free wall, (2) 36%, posteroseptal, (3) 8%, right free wall, and (4) 3%, anteroseptal. The presence of concealed APs accounts for approximately 30% of patients with apparent SVT referred for electrophysiologic studies (EPS). These patients do not have "classic" WPW syndrome because no delta wave is present, but they do have the potential for orthodromic tachycardia.

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