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Part of the Hardware glossary: AV, an abbreviation for audio/video, is frequently used as a generic term for the audio and video components and capabilities in home entertainment system and related product descriptions and reviews. This was last updated in February 2011.
First Degree AV Block. First-degree AV block is a disease that affects the electrical conduction system in the heart. In first-degree AV block, the impulse from the atria to the ventricles through the AV node is delayed. This area of conduction is known as the PR interval and thus first-degree AV block is also known as PR prolongation.