What are type A and B 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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WPW syndrome has been described by some as either type A or type B, depending on the appearance of the delta wave/QRS complex in the precordial leads. Type A is described as having an upright positive delta wave in all precordial leads with a resultant R greater than S amplitude in lead V1. Type B has a predominantly negative delta wave and QRS complex in V1 and V2 and becomes positive in transition to the lateral leads, much as in left bundle-branch block (LBBB).

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