| 2:1 atrioventricular block during atrioventricular node reentrant tachycardia. | |
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MedLine Citation:
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PMID: 8962565 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: The purpose of this study was to determine the incidence and to clarify the mechanism of 2:1 atrioventricular (AV) block during AV node reentrant tachycardia induced in the electrophysiology laboratory. BACKGROUND: In patients with 2:1 AV block during AV node reentrant tachycardia, the absence of a His bundle potential in the blocked beats has been considered evidence of intranodal, lower common pathway block. METHODS: In consecutive patients with AV node reentrant tachycardia, the incidence of 2:1 AV block and the response to atropine and a single ventricular extrastimulus was observed. RESULTS: Persistent 2:1 AV block occurred in 13 of 139 patients with AV node reentrant tachycardia. A His bundle deflection was present in the blocked beats in eight patients and absent in five. Patients with 2:1 AV block had a shorter tachycardia cycle length than did patients without such block (mean +/- SD 312 +/- 32 vs. 353 +/- 55 ms, p < 0.01). Atropine did not alter the 2:1 block in any patient. In every patient, a single ventricular extrastimulus introduced during the tachycardia converted the 2:1 block to 1:1 conduction. CONCLUSIONS: The incidence of induced 2:1 AV block during AV node reentrant tachycardia is approximately 10%. The lack of a response to atropine and the consistent conversion of 2:1 block to 1:1 conduction by a ventricular extrastimulus indicate that, regardless of the presence or absence of a His bundle potential in blocked beats, 2:1 block during AV node reentrant tachycardia is due to functional infranodal block. |
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Authors:
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K C Man; K Brinkman; F Bogun; B Knight; M Bahu; R Weiss; R Goyal; M Harvey; E G Daoud; S A Strickberger; F Morady |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of the American College of Cardiology Volume: 28 ISSN: 0735-1097 ISO Abbreviation: J. Am. Coll. Cardiol. Publication Date: 1996 Dec |
Date Detail:
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Created Date: 1997-01-16 Completed Date: 1997-01-16 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8301365 Medline TA: J Am Coll Cardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1770-4 Citation Subset: AIM; IM |
Affiliation:
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Department of Internal Medicine, University of Michigan, Ann Arbor 48109-0022, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anti-Arrhythmia Agents / pharmacology Atropine / pharmacology Bundle of His / physiopathology Cardiac Pacing, Artificial Electrocardiography Female Heart Block / etiology*, physiopathology Humans Male Middle Aged Prospective Studies Tachycardia, Atrioventricular Nodal Reentry / complications*, 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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