Bilateral bifascicular blocks, also called bilateral bundle-branch blocks, include complete right bundle-branch block (RBBB) combined with either a left anterior fascicular block (LAFB) or left posterior fascicular block (LPFB).
The prevalence of the combination RBBB + LAFB in hospital patients is 0.5%–1%, but the combination of RBBB + LPFB is at least 20 times rarer. The etiologies of these conduction block patterns are the same as in isolated fascicular blocks: coronary heart disease and cardiomyopathies of other origin, Lenègre’s disease, hypertensive heart disease, heart valve operations, and rare conditions. Bilateral bifascicular blocks are clinically important because they represent potential precursors of complete infrahisarian atrioventricular (AV) block.
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© 2009 Springer-Verlag London Limited
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(2009). Bilateral Bifasciular Blocks. In: The ECG Manual. Springer, London. https://doi.org/10.1007/978-1-84800-171-8_11
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DOI: https://doi.org/10.1007/978-1-84800-171-8_11
Publisher Name: Springer, London
Print ISBN: 978-1-84800-170-1
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