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Latent Mahaim Fiber as a Cause of Antidromic Reciprocating Tachycardia: Recognition and Successful Radiofrequency Ablation
Author(s) -
DAVIDSON NEIL C.,
MORTON JOSEPH B.,
SANDERS PRASHANTHAN,
KALMAN JONATHAN
Publication year - 2002
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1046/j.1540-8167.2002.00074.x
Subject(s) - medicine , antidromic , cardiology , tachycardia , reciprocating motion , sinus rhythm , ablation , radiofrequency ablation , atrial fibrillation , electrophysiology , mechanical engineering , gas compressor , engineering
Latent Mahaim Fiber. The term “Mahaim fiber” usually is applied to an atriofascicular fiber that inserts distally into the right bundle branch and forms the anterograde limb of a reciprocating tachycardia. One of the features that has been used to describe the physiology of Mahaim fibers is the presence of anterograde preexcitation. We describe two patients who had a clinical tachycardia consistent with a “Mahaim tachycardia” in whom there was no evidence or minimal evidence of anterograde preexcitation during sinus rhythm or atrial pacing. In both patients, the tachycardia was rendered noninducible by radiofrequency ablation at the site of Mahaim potentials at the tricuspid annulus, and a long‐term cure was achieved. This is the first description of a “latent Mahaim fiber” that does not cause preexcitation but which can support antidromic reciprocating tachycardia.