Key result
Case report details alternating complete LBBB, RBBB, and paroxysmal third-degree AV block in a 52-year-old.
Why the study?
Coexisting multiple patterns of alternating bundle branch block combined with paroxysmal atrioventricular block are rare and clinically significant electrocardiographic manifestations.
This case report highlights a rare presentation of multiple alternating bundle branch blocks coexisting with paroxysmal third-degree atrioventricular block.
A 52-year-old male patient presented with coexisting electrocardiographic manifestations: 1: Alternation between wide and narrow QRS complexes of complete left bundle branch block (LBBB); 2: Alternation between wide and narrow QRS complexes of complete right bundle branch block (RBBB); 3: Paroxysmal third-degree atrioventricular block (PAVB).
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Li et al. (2026) studied this question. A 52-year-old male patient presented with coexisting electrocardiographic manifestations of alternating complete left and right bundle branch blocks and paroxysmal third-degree atrioventricular block.
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