The observation of alternating tachycardia cycle lengths during slow pathway ablation provides further evidence for the multifiber structure of the AV node in patients with AV reentrant junctional tachycardia.
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May signal multiple retrograde pathways in AVNRT ablation; leaves open broader applicability of multifiber AV node model.
This report deals with a patient with atrioventricular (AV) reentrant junctional tachycardia who, during radiofrequency ablation of her slow pathway, developed both anterior and posterior type of slow-fast atrioventricular nodal reentry; in both tachycardias different fibers were alternately utilized for retrograde conduction, thus resulting in alternating tachycardia cycle lengths. This observation provides further evidence in favor of the multifiber structure of the AV node in patients with AV reentrant junctional tachycardia.
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Katritsis et al. (1993) studied this question.
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