Similarly, block in the right bundle branch causes right bundle branch block ( RBBB). Overview of bundle branch blocks and fascicular blocks Bundle branch blocks (right and left bundle branch block)Īnatomical or functional block in the left bundle branch causes left bundle branch block (LBBB). Altered electrical axis – Changes in the depolarization sequence may also alter the electrical vectors and thus the electrical axis.In each of these blocks, the QRS morphology will have a characteristic appearance which makes it fairly easy to diagnose them. Altered QRS morphology – Because the normal sequence of depolarization is altered in bundle branch blocks and fascicular blocks, the QRS morphology will also be altered.Similarly, block in the right bundle branch causes right bundle branch block, in which the right ventricle will be depolarized by impulses spreading from the left ventricle. Those impulses will spread through the right ventricle partly or entirely outside of the conduction system which will be slow and therefore cause wide QRS complex. ![]() The consequence of left bundle branch block is that the left ventricle will be depolarized by impulses spreading from the right ventricle.
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