Left bundle branch block overview: Difference between revisions
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Revision as of 18:36, 6 February 2013
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]
Overview
Left bundle branch block is a cardiac conduction abnormality seen on the electrocardiogram (ECG) whereby there is an impairment of transmission of the cardiac electrical impulse along the fibers of the left main bundle branch, or both the left anterior fascicle and left posterior fascicle. This conduction disturbance is characterized by wide (greater than or equal to 0.12 seconds) QRS complexes. In this condition, activation of the left ventricle is delayed, which results in the left ventricle contracting later than the right ventricle.