what is a bundle block of the heart
Bundle branch block A bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart.
Purkinje fibers During the ventricular contraction portion of the cardiac cycle, the Purkinje fibers carry the contraction impulse from both the left and right bundle branch to the myocardium of the ventricles. This causes the muscle tissue of the ventricles to contract and generate force to eject blood out of the heart, either to the pulmonary circulation from the right ventricle or to the systemic circulation from the left ventricle.[2]