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: Sara Zand, M.D.[2] Soroush Seifirad, M.D.[3] Cafer Zorkun, M.D., Ph.D. [4] Qasim Khurshid, M.B.B.S [4]

Overview

Complete heart block may be transeint due to increased parasympathetic tone defining vagally mediated atrioventricular block or due to persistent infranodal block whether there is atrioventricular conduction block distal to the atrioventricular node.

Classification

Term	Classification	Definition
Atrioventricular block	First-degree atrioventricular block	P waves associated with 1:1 atrioventricular conduction PR interval >200 ms atrioventricular delay because no P waves are blocked
	Second- degree atrioventricular block	P waves with a constant rate (<100 bpm) Atrioventricular conduction is present but not 1:1 Mobitz type I P waves with a constant rate (<100 bpm) Presence of periodic single non conducted P wave associated with P waves before and after the non conducted P wave with inconstant PR intervals Mobitz type II Presence of P waves with a constant rate (< 100 bpm) with a periodic single non conducted P wave associated with other P waves before and after the non conducted P wave with constant PR intervals (excluding 2:1 atrioventricular block) 2:1 atrioventricular block P waves with a constant rate (or near-constant rate because of ventriculophasic sinus arrhythmia) rate (<100 bpm), every other P wave conducts to the ventricles Advanced, high-grade or high-degree atrioventricular block ≥2 consecutive P waves at a constant physiologic rate that do not conduct to the ventricles with evidence for some atrioventricular conduction
	Third-degree atrioventricular block (complete heart block)	No evidence of atrioventricular conduction Vagally mediated atrioventricular block Any type of atrioventricular block due to increased parasympathetic tone Infranodal block Atrioventricular conduction block with evidence of conduction block distal to the atrioventricular node