Third degree AV block classification: Difference between revisions
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==Overview== | ==Overview== | ||
There is no established system for the classification of third degree AV block. But AV dissociation can be further classified into two subtypes as [[AV dissociation]] by default and AV dissociation by usurpation. | There is no established system for the classification of third degree AV block. But [[AV dissociation]] can be further classified into two subtypes as [[AV dissociation]] by default and [[AV dissociation]] by usurpation. | ||
==Classification== | ==Classification== | ||
There is no established system for the classification of third degree AV block. But AV dissociation can be further classified into two subtypes as follows: | There is no established system for the classification of third degree AV block. But [[AV dissociation]] can be further classified into two subtypes as follows: | ||
===AV Dissociation by Default=== | ===AV Dissociation by Default=== | ||
* In this [[rhythm]] there is an independent ventricular pacemaker response to slowing of the dominant atrial pacemaker. | * In this [[rhythm]] there is an independent [[ventricular pacemaker]] response to slowing of the dominant [[atrial]] [[pacemaker]]. | ||
===AV Dissociation by Usurpation=== | ===AV Dissociation by Usurpation=== | ||
* In this rhythm there is acceleration of a latent pacemaker that takes control of cardiac conduction by exceeding the intrinsic atrial rate. | * In this [[rhythm]] there is acceleration of a latent [[pacemaker]] that takes control of cardiac conduction by exceeding the intrinsic atrial rate. | ||
=== Based on electrocardiogram third degree block can be classified as=== | === Based on electrocardiogram third degree block can be classified as=== | ||
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* Regular P-P interval<ref name="Rosen1973">{{cite journal|last1=Rosen|first1=Kenneth M.|title=Chronic Heart Block in Adults|journal=Archives of Internal Medicine|volume=131|issue=5|year=1973|pages=663|issn=0003-9926|doi=10.1001/archinte.1973.00320110047006}}</ref> | * Regular P-P interval<ref name="Rosen1973">{{cite journal|last1=Rosen|first1=Kenneth M.|title=Chronic Heart Block in Adults|journal=Archives of Internal Medicine|volume=131|issue=5|year=1973|pages=663|issn=0003-9926|doi=10.1001/archinte.1973.00320110047006}}</ref> | ||
* Regular [[R-R interval]] | * Regular [[R-R interval]] | ||
* No relationship between the P waves and [[QRS complexes]] | * No relationship between the [[P waves]] and [[QRS complexes]] | ||
* More [[P waves|P wave]]<nowiki/>s are present than [[QRS complexes]] | * More [[P waves|P wave]]<nowiki/>s are present than [[QRS complexes]] | ||
Revision as of 12:38, 3 July 2020
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Soroush Seifirad, M.D.[2] Cafer Zorkun, M.D., Ph.D. [3] Qasim Khurshid, M.B.B.S [4]
Overview
There is no established system for the classification of third degree AV block. But AV dissociation can be further classified into two subtypes as AV dissociation by default and AV dissociation by usurpation.
Classification
There is no established system for the classification of third degree AV block. But AV dissociation can be further classified into two subtypes as follows:
AV Dissociation by Default
- In this rhythm there is an independent ventricular pacemaker response to slowing of the dominant atrial pacemaker.
AV Dissociation by Usurpation
- In this rhythm there is acceleration of a latent pacemaker that takes control of cardiac conduction by exceeding the intrinsic atrial rate.
Based on electrocardiogram third degree block can be classified as
- Regular P-P interval[1]
- Regular R-R interval
- No relationship between the P waves and QRS complexes
- More P waves are present than QRS complexes
References
- ↑ Rosen, Kenneth M. (1973). "Chronic Heart Block in Adults". Archives of Internal Medicine. 131 (5): 663. doi:10.1001/archinte.1973.00320110047006. ISSN 0003-9926.