Atrioventricular block
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| Atrioventricular block | |
|---|---|
| Classification and external resources | |
| ICD-10 | I44.0-I44.3 |
| ICD-9 | 426.0-426.1 |
| eMedicine | med/189 |
| MeSH | D006327 |
An atrioventricular block (or AV block) involves the impairment of the conduction between the atria and ventricles of the heart.
The causes of pathological AV block are varied and include ischaemia, infarction, fibrosis or drugs. Certain AV blocks can also be found as normal variants, such as in athletes or children, and are benign.[1] Strong vagal stimulation may also produce AV block. The cholinergic receptor types affected are the muscarinic receptors.
There are three types:
- First degree AV block - PR interval greater than 0.20sec.
- Second degree AV block - Type 1 (aka Mobitz 1, Wenckebach): Progressive prolongation of PR interval with dropped beats (the PR interval gets longer and longer; finally one beat drops) . Type 2 (aka Mobitz 2, Hay): PR interval remains unchanged prior to the P wave which suddenly fails to conduct to the ventricles.
- Third degree AV block - No association between P waves and QRS complexes.
[edit] References
- ^ Lilly, Leonard (2006). Pathophysiology of Heart Disease. Lippincott Williams and Wilkins. ISBN 978-0781763219.
[edit] External links
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