Abstract
Atrioventricular (AV) blocks are rhythms in which conduction through the AV node is altered. This chapter describes the AV blocks on the basis of the PR interval and the relationship between the P waves and the QRS complexes. First-degree AV block is most often generated by an impulse from the sinoatrial node and produces a normal P wave. Second-degree AV block is further subcategorized into Mobitz type I and Mobitz type II AV block. Third-degree AV block , also known as heart block or complete heart block , represents the most worrisome form of AV conduction blockade. AV dissociation is a term used to describe any rhythm disturbance where the atrial and ventricular pacemakers function independently of each other.
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