Atrioventricular block pathophysiology

	Atrioventricular block Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Edzel Lorraine Co, DMD, MD [2]

Overview

Atrioventricular (AV) block is caused by one of the following mechanisms i.e. fibrosis or degeneration of the conduction system, ischemic heart disease, or medications.

First-degree Atrioventricular Block
- A delay in electrical heart conduction without significant interruption occurs from atria to ventricle.
- This occurs at the level of AV node or slightly below it.
- In this situation, no hemodynamic instability happens.