What are the diagnostic considerations for Wolff-Parkinson-White (WPW) syndrome in the presence of left free wall bypass tract atrioventricular (AV) reentrant tachycardia (AVRT)?

Updated: Jan 08, 2017
  • Author: Christopher R Ellis, MD, FACC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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Conversely, left free wall bypass tract AVRT will slow with LBBB (ipsilateral to the accessory pathway). Septal pathways may be slightly affected by either RBBB (anteroseptal) or LBBB (posteroseptal), but this would be detected only on electrophysiologic study (EPS). The eponym Coumel is also applied to this rule.

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