AV Node Bypass Tracts and Enhanced AV Conduction: Relation to Ventricular Preexcitation

  • David G. Benditt
  • David Dunbar
  • Adrian Almquist
  • Shanda Pool-Schneider


The preexcitation syndromes comprise a diverse group of conduction disturbances in which the common thread is the ability of atrial impulses to activate all or part of the ventricular myocardium earlier than would have been expected had AV conduction been restricted to the normal cardiac conduction system [1–4]. Despite earlier doubts [5–7], it is now generally agreed that most forms of ventricular preexcitation are best accounted for by the presence of functioning accessory conduction tissue bypassing all or portions of the specialized cardiac conduction system. [1–4,8,9]. However, controversy continues to surround the subset of preexcitation syndromes in which the principal conduction disturbance appears to be a “short-circuiting” of the primary physiologic function of the AV node, namely, the slowing of conduction of supraventricular impulses between the atria and His bundle.


Versus Node Bypass Tract Pace Cycle Length Versus Conduction Ventricular Preexcitation 
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© Martinus Nijhoff Publishing 1986

Authors and Affiliations

  • David G. Benditt
  • David Dunbar
  • Adrian Almquist
  • Shanda Pool-Schneider

There are no affiliations available

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