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Duality of Conduction in an Atriofascicular Pathway During Antidromic Tachycardia
Author(s) -
NAMBOODIRI NARAYANAN,
SHARMA GAUTAM,
SANDERS PRASHANTHAN
Publication year - 2009
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.2009.02484.x
Subject(s) - antidromic , medicine , tachycardia , cardiology , thermal conduction , alternation (linguistics) , nodal , accessory pathway , reentrancy , atrioventricular reentrant tachycardia , catheter ablation , electrophysiology , atrial fibrillation , condensed matter physics , thermodynamics , physics , linguistics , philosophy
Cycle length alternation in atrioventricular reentrant tachycardia due to alternating conduction time over the dual atrioventricular (AV) nodal pathways has been well described. Atriofascicular pathways with decremental conduction characteristics (Mahaim fibers) are known to contain accessory AV nodal tissue. We describe a case of cycle‐length alternans in antidromic tachycardia through an atriofascicular pathway because of alternation in conduction time in the antegrade limb. The possible mechanisms of this phenomenon, rarely described in atriofascicular pathways, are discussed.