What is the role of ventriculoatrial (VA) interval in the diagnosis of 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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The ventriculoatrial (VA) interval (a measurement of conduction over the accessory pathway) is generally constant over a wide range of ventricular-paced rates and coupling intervals of PVCs and during the tachycardia in the absence of aberration. Similar short VA intervals can be observed in some patients during AV nodal reentry, but if the VA conduction time or RP interval is the same during tachycardia and ventricular pacing at comparable rates, an AP is almost certainly present (VA linking).

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