Atrioventricular block classification
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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 a medical condition wherein there is a disturbance in the conduction of an electro-cardiac impulse traveling from the atria to the ventricle, as a result of an anatomic or functional aberration in the conduction system. It is classified into three types, which are the first degree AV block, second-degree AV block, and third-degree AV block/complete AV block.
Classification
- First degree AV block
- Prolongation of PR interval of more than 200 milliseconds
- Second degree AV block also known as Mobitz I and Mobitz II
- Type I AV Block (Wenckebach)
- Progressive prolongation of the PR interval before dropped beat.
- Usually block is in the AV node
- Type II AV Block
- No change in PR interval before dropped beat
- Usually infranodal
- Type I AV Block (Wenckebach)
- Third degree AV block also known as complete heart block
- No relationship between atrial and ventricular activity.