Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Hemiblock
Introduction
Overview
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
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
References
- ↑ ABC of Clinical Electrocardiography, Morris F, Edhouse J, Brady WJ, Camm J, 2003
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]