Bundle branch reentry ventricular tachycardia with two distinct left bundle branch block morphologies.

Abstract:

INTRODUCTION:Bundle branch reentry ventricular tachycardia (VT) is usually amenable to treatment with radiofrequency ablation. Different QRS morphologies during VT are possible when anterograde ventricular activation is over the left bundle branch. Manifestations of this reentrant tachycardia with more than one QRS morphology with anterograde activation via the right bundle have not been reported and would be unusual due to the more discrete anatomy of the right bundle branch. METHODS AND RESULTS:An electrophysiologic study was conducted in a patient with dilated ventricle and diminished ventricular function with VT. Typical characteristics of bundle branch reentry were noted when VT was induced. The study was notable for the presence of a right bundle recording only during macroreentrant beats or VT and the distal location of the recording. Radiofrequency ablation was performed. Postablation stimulation again induced VT, proven to be of the same bundle branch reentry mechanism but of a different QRS morphology. A second ablation was required for complete ablation of this patient's bundle branch reentry VT. CONCLUSION:In bundle branch reentry utilizing the left bundle as the retrograde limb and the right bundle branch as the anterograde limb of the circuit, VT of more than one distinct morphology can be seen. Careful evaluation to assess for the persistence of VT of the same mechanism is necessary to ensure complete ablation of the reentrant circuit. Preexisting right bundle disease and a dilated heart with more dispersed distal right bundle branches may predispose to such a phenomenon.

authors

Wang CW,Sterba R,Tchou P

doi

10.1111/j.1540-8167.1997.tb01832.x

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

688-93

issue

6

eissn

1045-3873

issn

1540-8167

journal_volume

8

pub_type

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