Key result
Cardiac sarcoidosis presents with rare alternating RBBB and LBBB alongside narrow QRS complexes.
Why the study?
A rare type of alternating bundle branch block with alternation of complete right and left bundle branch block and narrow QRS complexes was observed in a patient with cardiac sarcoidosis.
Highlights a rare electrocardiographic presentation of alternating bundle branch block in cardiac sarcoidosis.
May alert clinicians to sarcoidosis in alternating bundle branch block; extends ECG spectrum but leaves open diagnostic protocols.
The authors report a rare type of alternating bundle branch block observed in a patient with cardiac sarcoidosis. Not only alternation of complete right and left bundle branch block but also narrow QRS complexes were observed on electrocardiogram. The mechanism of these unusual findings is briefly discussed.
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Konno et al. (2005) studied this question. Cardiac sarcoidosis presented with a rare alternating bundle branch block involving both complete right and left bundle branch blocks alongside narrow QRS complexes on electrocardiogram.
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