Conduction system disease

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List of terms related to Conduction system disease

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Conduction system disease is defined as an abnormality of either electrical impulse generation or conduction in the heart.

Classification

A heart block can be a blockage at any level of the electrical conduction system of the heart:

• SA Nodal Block: Blocks that occur within the sinoatrial node (SA node) are described as SA nodal blocks.
• AV Nodal Block: Blocks that occur within the atrioventricular node (AV node) are described as AV nodal blocks.
• Infra-Hisian Block: Blocks that occur below the AV node are known as Infra-Hisian blocks (named after the bundle of His).
• Bundle Branch Block: Blocks that occur within the left or right bundle branches are known as bundle branch blocks.
• Hemiblock: Blocks that occur within the fascicles of the left bundle branch are known as hemiblocks.

Clinically speaking, most of the important heart blocks are AV nodal blocks and infrahisian blocks.

See Also

Heart block