Third degree AV block classification
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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.