Introduction : Right bundle branch block (RBBB) is a condition when left ventricle is depolarized first before right ventricle. Two types of RBBB can be distinguished, anatomical and functional. In anatomical RBBB, the conduction to the right bundle is severed and cannot deliver any impulse propagation. Functional RBBB is due to longer refractory period. When impulse arrived with longer interval, it can propagates via the right bundle.
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