First degree AV block classification: Difference between revisions
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==Classification== | ==Classification== | ||
There is no established system for the classification of First degree AV block. | There is no established system for the classification of [[First degree AV block]]. | ||
<ref name="KusumotoSchoenfeld2019">{{cite journal|last1=Kusumoto|first1=Fred M.|last2=Schoenfeld|first2=Mark H.|last3=Barrett|first3=Coletta|last4=Edgerton|first4=James R.|last5=Ellenbogen|first5=Kenneth A.|last6=Gold|first6=Michael R.|last7=Goldschlager|first7=Nora F.|last8=Hamilton|first8=Robert M.|last9=Joglar|first9=José A.|last10=Kim|first10=Robert J.|last11=Lee|first11=Richard|last12=Marine|first12=Joseph E.|last13=McLeod|first13=Christopher J.|last14=Oken|first14=Keith R.|last15=Patton|first15=Kristen K.|last16=Pellegrini|first16=Cara N.|last17=Selzman|first17=Kimberly A.|last18=Thompson|first18=Annemarie|last19=Varosy|first19=Paul D.|title=2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society|journal=Circulation|volume=140|issue=8|year=2019|issn=0009-7322|doi=10.1161/CIR.0000000000000628}}</ref> | |||
{| class="wikitable" | |||
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Term | |||
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Classification | |||
! align="center" style="background:#4479BA; color: #FFFFFF;" + |Definition | |||
! | |||
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| rowspan="3" |[[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]] | |||
| | |||
|} | |||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} |
Revision as of 04:55, 22 July 2021
First degree AV block Microchapters |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ahmed Elsaiey, MBBCH [2]
Overview
An atrioventricular block (or AV block) is a type of heart block involving impairment of the conduction between the atria and the ventricles of the heart. It usually involves the atrioventricular node, but it can involve other structures too. AV block is categorized according to the degree and the site of conduction block. In first-degree AV block, all atrial impulses are conducted to the ventricles; however, there is a delay in conduction within the AV node resulting in a prolonged PR interval on ECG (>200 msec or >5 small blocks). In other words, a first-degree AV block is a slowed conduction without loss of atrioventricular synchrony.
Classification
There is no established system for the classification of First degree AV block. [1]
Term | Classification | Definition | |
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Atrioventricular block | First-degree atrioventricular block |
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Second- degree atrioventricular block |
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Third-degree atrioventricular block (complete heart block) |
|
References
- ↑ Kusumoto, Fred M.; Schoenfeld, Mark H.; Barrett, Coletta; Edgerton, James R.; Ellenbogen, Kenneth A.; Gold, Michael R.; Goldschlager, Nora F.; Hamilton, Robert M.; Joglar, José A.; Kim, Robert J.; Lee, Richard; Marine, Joseph E.; McLeod, Christopher J.; Oken, Keith R.; Patton, Kristen K.; Pellegrini, Cara N.; Selzman, Kimberly A.; Thompson, Annemarie; Varosy, Paul D. (2019). "2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society". Circulation. 140 (8). doi:10.1161/CIR.0000000000000628. ISSN 0009-7322.