Bradycardia pathophysiology: Difference between revisions
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There are generally two types of problems that result in bradycardias: | There are generally two types of problems that result in bradycardias: | ||
===Disorders of the [[sinus node]] === | ===Disorders of the [[sinus node]] === | ||
* Impaired automaticity - Sinus node dysfunction/[[sick sinus syndrome]]) | * Impaired automaticity - Sinus node dysfunction/[[sick sinus syndrome]])<ref name="pmid6620520">{{cite journal| author=Alpert MA, Flaker GC| title=Arrhythmias associated with sinus node dysfunction. Pathogenesis, recognition, and management. | journal=JAMA | year= 1983 | volume= 250 | issue= 16 | pages= 2160-6 | pmid=6620520 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=6620520 }} </ref> | ||
* Exit block - Impaired conduction of the impulse from the sinus node into the surrounding atrial tissue | * Exit block - Impaired conduction of the impulse from the sinus node into the surrounding atrial tissue | ||
===Disorders of the [[atrioventricular node]] (AV node)=== | ===Disorders of the [[atrioventricular node]] (AV node)=== | ||
* Atrioventricular conduction disturbances ([[First degree AV block|1<sup>o</sup> AV block]], [[Second degree AV block|2<sup>o</sup> type I AV block]], [[Second degree AV block|2<sup>o</sup> type II AV block]], [[Third degree AV block|3<sup>o</sup> AV block]]) may result from impaired conduction in the AV node, or anywhere below it, such as in the bundle of HIS. | * Atrioventricular conduction disturbances ([[First degree AV block|1<sup>o</sup> AV block]], [[Second degree AV block|2<sup>o</sup> type I AV block]], [[Second degree AV block|2<sup>o</sup> type II AV block]], [[Third degree AV block|3<sup>o</sup> AV block]]) may result from impaired conduction in the AV node, or anywhere below it, such as in the bundle of HIS. | ||
Revision as of 02:03, 25 August 2020
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Bradycardia Microchapters |
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Bradycardia pathophysiology On the Web |
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Risk calculators and risk factors for Bradycardia pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: M.Umer Tariq [2]
Overview
Pathophysiology
It is difficult and sometimes impossible to assign a mechanism to any particular bradycardia. However, the underlying mechanism is not clinically relevant to treatment, which is the same in both cases of sick sinus syndrome: a permanent pacemaker.
There are generally two types of problems that result in bradycardias:
Disorders of the sinus node
- Impaired automaticity - Sinus node dysfunction/sick sinus syndrome)[1]
- Exit block - Impaired conduction of the impulse from the sinus node into the surrounding atrial tissue
Disorders of the atrioventricular node (AV node)
- Atrioventricular conduction disturbances (1o AV block, 2o type I AV block, 2o type II AV block, 3o AV block) may result from impaired conduction in the AV node, or anywhere below it, such as in the bundle of HIS.
References
- ↑ Alpert MA, Flaker GC (1983). "Arrhythmias associated with sinus node dysfunction. Pathogenesis, recognition, and management". JAMA. 250 (16): 2160–6. PMID 6620520.