What is thirddegree atrioventricular block

This is also known as complete heart block, with no P waves conducted to the ventricles. The RR interval is regular unless there are premature ventricular complexes. The level of the block may be either at the AV node (usually with a narrow QRS) or below the node (with a wide QRS and a particularly slow heart rate).

Complete heart block is one form, but not the only form, of AV dissociation. Not infrequently a patient will have a rhythm in which only occasional P waves conduct, as indicated by a transient shortening of the RR interval. Officially this does not constitute complete heart block since a P wave does get through the AV node to the ventricles. This incomplete AV dissociation is commonly referred to as high-degree AV block.

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