How is retrograde atrial activation over the AP in Wolff-Parkinson-White (WPW) syndrome confirmed on EPS?

Updated: Jan 08, 2017
  • Author: Christopher R Ellis, MD, FACC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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Retrograde atrial activation over the AP can be confirmed by inducing premature ventricular complexes (PVCs) during tachycardia to determine whether retrograde atrial excitation can occur from the ventricle at a time when the His bundle is refractory (His refractory PVCs). Failure to advance the atrium when the His is refractory does not exclude an AP, particularly if far from the pacing site (left lateral pathway).

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