First degree AV block classification: Difference between revisions
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__NOTOC__ | __NOTOC__ | ||
{{First degree AV block}} | {{First degree AV block}} | ||
{{CMG}}; {{AE}} {{AEL}} | {{CMG}}; {{AE}} {{Sara.Zand}} {{AEL}} | ||
==Overview== | ==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 | 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. [[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== | ==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]]. | ||
*Table below shown the classification of [[atrioventricular 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> | <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" | {| class="wikitable" | ||
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* [[atrioventricular delay]] because no P waves are blocked | * [[atrioventricular delay]] because no P waves are blocked | ||
|- | |- | ||
| [[Second- degree | | [[Second-degree AV block]] | ||
| | | | ||
* P waves with a constant rate (<100 bpm) | * P waves with a constant rate (<100 bpm) | ||
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:* ≥2 consecutive P waves at a constant physiologic rate that do not conduct to the [[ventricles ]] with evidence for some [[atrioventricular conduction]] | :* ≥2 consecutive P waves at a constant physiologic rate that do not conduct to the [[ventricles ]] with evidence for some [[atrioventricular conduction]] | ||
|- | |- | ||
|[[Third-degree | |[[Third-degree AV block]] ([[complete heart block]]) | ||
| | | | ||
*No evidence of [[atrioventricular conduction]] | *No evidence of [[atrioventricular conduction]] |
Latest revision as of 17:42, 27 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: Sara Zand, M.D.[2] Ahmed Elsaiey, MBBCH [3]
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. 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.
- Table below shown the classification of atrioventricular block.
Term | Classification | Definition | |
---|---|---|---|
Atrioventricular block | First-degree atrioventricular block |
| |
Second-degree AV block |
| ||
Third-degree AV 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.