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A bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart. bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart.
BBB occurs when one of the bundle branches becomes diseased or damaged, and stops conducting electrical impulses; that is, a bundle branch becomes âblocked.â The chief effect of a bundle branch block is to disrupt the normal, coordinated and simultaneous distribution of the electrical signal to the two ventricles.