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<unk>  is collectively referred to as "infra-Hisian blocks". To be specific, blocks that occur in the right or left<unk>  branches are called<unk>  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<unk>  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<unk>  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. Pacing A 2000 study found that direct His<unk>  pacing is more effective in producing synchronized ventricular contraction—and therefore in improving cardiac function—than apical pacing.
Bundle of His
Biomesh
Evenor
Bridge 
Kids of Courage
Theriac
Explorers of the Body
Cylinder manifold