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A Single Mahaim Fiber Causing Both Antidromic and Orthodromic Reciprocating Tachycardia
Author(s) -
KALBFLEISCH STEVEN,
BOWMAN KATHY,
AUGOSTINI RALPH
Publication year - 2008
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 - 10.1111/j.1540-8167.2007.01052.x
Subject(s) - orthodromic , medicine , accessory pathway , antidromic , tachycardia , cardiology , sinus rhythm , supraventricular tachycardia , reciprocating motion , catheter ablation , ablation , electrophysiology , atrial fibrillation , mechanical engineering , gas compressor , engineering
We describe the case of a 56‐year‐old woman referred for electrophysiological (EP) testing for medically refractory supraventricular arrhythmias. During the EP study, the patient was found to have a right free wall atriofasicular (Mahaim type) accessory pathway and an inducible left bundle morphology preexcited tachycardia secondary to antidromic reciprocating tachycardia. The patient also had an inducible narrow complex orthodromic reciprocating tachycardia (ORT). Mapping revealed that the earliest site of retrograde atrial activation during ORT was along the lateral tricuspid annulus. This was the same location where the atriofasicular accessory pathway potential was recorded during sinus rhythm. Radiofrequency ablation at this site eliminated inducibility of both tachycardias and any evidence of antegrade or retrograde accessory pathway conduction. This report describes the case of a very rare right free wall Mahaim type fiber with both antegrade and retrograde conduction capabilities responsible for both antidromic and ORT.