This definition appears rarely
Samples in periodicals archive:
A description of right bundle branch block (RBBB) and left bundle branch block (LBBB), and how to tell when they are present.
Right bundle branch block (RBBB) and left bundle branch block (LBBB) may or may not have medical significance, depending on the setting in which they occur.
A heart attack can sometimes cause the bundle branch to slow in its electrical impulses; this can happen on both sides or only on the left or right bundle branch block. The scarring that can occur after heart surgery can also put pressure on the bundle branch and slow the electrical impulses from reaching the heart.