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]
Overview
There is no established system for the classification of third degree AV block.
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.