<P> Disorders affecting the cardiomyocytes that make up the electrical conduction system of the heart are called heart blocks . Heart blocks are separated into different categories based on the location of the cellular damage . Damage to any of the conducting cells in or below the bundle of His are collectively referred to as "infra - Hisian blocks". To be specific, blocks that occur in the right or left bundle branches are called "bundle branch blocks", and those that occur in either the left anterior or the left posterior fascicles are called "fascicular blocks", or "hemiblocks". The conditions in which both the right bundle branch and either the left anterior fascicle or the left posterior fascicle are blocked are collectively referred to as bifascicular blocks, and the condition in which the right bundle branch, the left anterior fascicle, and the left posterior fascicle are blocked is called trifascicular block . Infra - hisian blocks limit the heart's ability to coordinate the activities of the atria and ventricles, which usually results in a decrease in its efficiency in pumping blood . </P> <P> A 2000 study found that direct His bundle pacing is more effective in producing synchronized ventricular contraction--and therefore in improving cardiac function--than apical pacing . </P> <P> These specialized muscle fibers in the heart were named after the Swiss cardiologist Wilhelm His, Jr., who discovered them in 1893 . </P>

Why is it called a bundle of his
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