Third degree AV block classification: Difference between revisions

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==Classification==
==Classification==
[[Atrioventricular block]] can be classified as follows:
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! align="center" style="background:#4479BA; color: #FFFFFF;" + |Term
! style="width: 200px; background: #4479BA;" | {{fontcolor|#FFF| [[First-degree atrioventricular block]]}}
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Classification
! style="width: 300px; background: #4479BA;" | {{fontcolor|#FFF| [[Second-degree atrioventricular block]]}}
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Definition
! style="width: 400px; background: #4479BA;" | {{fontcolor|#FFF| [[Third-degree atrioventricular block]]}}
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| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[P waves]] associated with 1:1 [[atrioventricular conduction]] and a [[PR interval]] >200 ms, 
| rowspan="3" |[[Atrioventricular block]]
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[P waves]] with a constant rate (<100 bpm), [[atrioventricular conduction]] is present but not 1:1
 
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | The width of this column is 400px
| [[First-degree atrioventricular block]]
|P waves associated with 1:1 [[atrioventricular ]] conduction, PR interval >200 ms, [[atrioventricular delay]] because no P waves are blocked
|-
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |[[atrioventricular]] delay, no P waves are blocked
| [[Second- degree]] [[atrioventricular block]]
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[Mobitz type I]]: P waves with a constant rate (<100 bpm) with a periodic single nonconducted P wave associated with P waves before and after the nonconducted P wave with inconstant [[PR intervals]]
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| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | The width of this column is 400px
* 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]]
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|-
|[[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]]
|
|}
|}
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==References==
==References==

Revision as of 13:56, 13 June 2021

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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

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)
  • Presence of periodic single non conducted P wave associated with P waves before and after the non conducted P wave with inconstant PR intervals
  • 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)
Third-degree atrioventricular block (complete heart block)

References


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