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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.
One of the causes of bundle branch block either right or left can be the surgical interruption of the Purkinje bundle. For example, when a patient has had heart surgery where the right bundle has been cut or damaged and the left bundle is intact this condition is known as right bundle branch block (RBBB).f there is a pattern similar to a bundle branch block but the width of the QRS complex is less than 0.12 seconds, we consider that to be an incomplete bundle branch block pattern. Incomplete right bundle branch block is very commonly seen and can be considered a normal variant of the QRS complex.