| Electrocardiographic observations in bradycardia and tachycardia-dependent atrioventricular block. Relationship to supernormal phase of intraventricular conduction. | |
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MedLine Citation:
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PMID: 1122774 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This report describes the clinical course of a patient with bradycardia and tachycardia-dependent atrioventricular block. Bradycardia dependent A-V block (phase 4 block) was transient and precipitated by spontaneous slowing of the sinus rate, atrial and ventricular extrasystoles; The degree of slowing (critical RP interval) required to induce A-V block increased progressively over a three-day period. Bradycardia-dependent A-V block was terminated mostly by critically times spontaneous or paced ventricular escape beats, but normally conducted atrial impulses also appeared to restore A-V conduction on several occasions. The tachycardia-dependent component was manifested by an unusual fatigue phenomenon in the His-Purkinje system seen only at an atrial pacing rate of 150 per minute. These observations document the presence of both bradycardia and tachycardia-dependent A-V block in the presence of a normal H-V time and also illustrate the dynamic nature of both phase 4 block and the period of "supernormal" intraventricular conduction. |
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Authors:
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S S Barold; L S Ong; J A Young |
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Publication Detail:
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Type: Case Reports; Journal Article |
Journal Detail:
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Title: Chest Volume: 67 ISSN: 0012-3692 ISO Abbreviation: Chest Publication Date: 1975 Apr |
Date Detail:
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Created Date: 1975-07-07 Completed Date: 1975-07-07 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0231335 Medline TA: Chest Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 450-7 Citation Subset: AIM; IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aged Bradycardia / complications*, physiopathology Electrocardiography* Female Heart Block / complications*, physiopathology Heart Conduction System / physiopathology Humans Pacemaker, Artificial Tachycardia / complications*, physiopathology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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