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Updated: Jun 20, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
Alternation of right bundle branch block with beats showing normal conduction and with a less complete right bundle
András Vereckei1, József Tenczer, Michael Hickman
1Department of Internal Medicine, Semmelweis University, School of Medicine, Budapest, Hungary. vereckei@kut.sote.hu
Abstract:
We report the case of an 80-year-old man with a preexistent right bundle branch block (RBBB) who underwent dobutamine stress echocardiography. As the sinus cycle length gradually decreased during the stress test, he first developed a 2:1 RBBB pattern alternating with beats showing normal conduction and then an alternating 2:1 less complete and more complete RBBB pattern. An elucidation of the potential mechanism of the latter very rare phenomenon is provided.
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