Which findings on ECG suggest a concealed AP 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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An AP in which only retrograde transmission of impulses can occur is called a concealed AP and is used only during circus movement tachycardia (CMT or ORT). A concealed AP is not detectable on the regular surface ECG findings, because the ventricle is not preexcited. Tachycardia due to a concealed AP should be considered when the QRS complex is normal and the retrograde P wave occurs well after completion of the QRS complex, out in the ST segment or even in the T wave (long R-P tachycardia).

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