Hemiblock

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Hemiblocks are defined as impaired conduction in the electrical system of the heart that occurs below the AV node within the fascicles of the left bundle branch.

Classification

Left Anterior Hemiblock

Left anterior hemiblock is caused by interruption of the anterior division of the left bundle branch. This fascicle is fragile, easily exposed to damage, and has a single blood supply (the left anterior descending coronary artery).

Left Posterior Hemiblock

Left posterior fascicular block is characterized by a mean frontal plane axis of >90° in the absence of other causes of right axis deviation. Left posterior hemiblock (left posterior fascicular block) is infrequent.[1] Its seen either in the setting of either RCA or LAD related pathologies.

References

  1. ABC of Clinical Electrocardiography, Morris F, Edhouse J, Brady WJ, Camm J, 2003