How is an automatic mechanism differentiated from reentry 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

An automatic mechanism may be differentiated from reentry by the following:

  • Presence of a warmup or cool-down period (which is due to its relation with catecholamine levels)
  • Inability to initiate or terminate SVT with programmed atrial stimulation
  • Usual unresponsiveness to electrical cardioversion

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