| 2:1 Atrioventricular block: order from chaos. | |
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MedLine Citation:
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PMID: 11326349 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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2:1 AV block can occur in either the AV node or the His-Purkinje system and cannot be classified into type I or type II second-degree AV block because there is only one PR interval to examine before the blocked P wave. It is inappropriate to use terms such as 2:1 or 3:1 type I or type II AV block because this characterization violates the accepted traditional definitions of type I and type II block based on electrocardiographic patterns and not on the anatomical site of block. Type I and type II second-degree AV block can progress to 2:1 AV block, and 2:1 AV block can regress to type I or type II block. Consequently, the site of the lesion in 2:1 block can often be determined by seeking the company 2:1 AV block keeps. An association with type I block and a narrow QRS complex almost always reflects AV nodal block but type I block with a wide QRS complex occurs more commonly in the His-Purkinje system than the AV node. Type II block, if correctly defined, is always infranodal. Outside of acute myocardial infarction, sustained 2:1 and 3:1 AV block with a wide QRS complex occurs in the His-Purkinje system in 80% of cases and 20% in the AV node. Administration of atropine in patients with His-Purkinje disease may increase the degree of AV block. |
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Authors:
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S S Barold |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: The American journal of emergency medicine Volume: 19 ISSN: 0735-6757 ISO Abbreviation: Am J Emerg Med Publication Date: 2001 May |
Date Detail:
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Created Date: 2001-04-30 Completed Date: 2001-05-24 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8309942 Medline TA: Am J Emerg Med Country: United States |
Other Details:
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Languages: eng Pagination: 214-7 Citation Subset: IM |
Affiliation:
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Electrophysiology Institute, Broward General Hospital, Ft. Lauderdale, FL, USA. ssbarold@aol.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anti-Arrhythmia Agents
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contraindications,
therapeutic use Atrioventricular Node / physiopathology Atropine / contraindications, therapeutic use Electrocardiography* Emergency Medical Services Heart Block* / classification, diagnosis, drug therapy, physiopathology Hemodynamics Humans Purkinje Fibers / physiopathology |
| Chemical | |
Reg. No./Substance:
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0/Anti-Arrhythmia Agents; 51-55-8/Atropine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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