A 68-year-old woman with a history of paroxysmal atrial fibrillation was referred for pulmonary vein isolation. After the pulmonary veins were isolated, burst atrial pacing during infusion of intravenous isoproterenol induced atrial flutter at a cycle length of 230 ms, with variable but rapid AV conduction. An alternating pattern of left bundle branch block (LBBB) and right bundle branch block (RBBB) was observed during the tachycardia (Figure 1). What is the mechanism of the alternating bundle branch block?
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- Supraventricular tachycardia with left aberrant conduction due to retrograde invasion into the left bundle branch.Circulation. 1968; 38: 474-479
- Lippincott, Williams, & Wilkins, Philadelphia2002 Clinical Cardiac Electrophysiology. Third Edition.
Published online: October 17, 2006
© 2007 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.