| Two-to-one AV block associated with the congenital long QT syndrome. | |
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MedLine Citation:
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PMID: 9930915 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Conduction abnormalities associated with long QT syndrome (LQTS) have been reported as "pseudo 2:1 AV block" due to sinus intervals shorter than ventricular refractoriness. METHOD AND RESULTS: We report the electrophysiologic characteristics of a patient suffering from congenital LQTS with episodes of true 2:1 AV block. Induction of 2:1 infra-Hisian blocks and return to 1:1 conduction were observed using single atrial and ventricular extrastimuli. The block was located in the Purkinje network but not in the myocardium. CONCLUSION: The His-Purkinje system of our LQTS patient displayed dynamic properties with a strong increase in refractoriness for short-long sequences and a decrease for long-short sequences that triggered intermittent 2:1 AV blocks. |
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Authors:
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E Pruvot; A De Torrente; G M De Ferrari; P J Schwartz; J J Goy |
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Publication Detail:
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Type: Case Reports; Journal Article |
Journal Detail:
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Title: Journal of cardiovascular electrophysiology Volume: 10 ISSN: 1045-3873 ISO Abbreviation: J. Cardiovasc. Electrophysiol. Publication Date: 1999 Jan |
Date Detail:
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Created Date: 1999-03-30 Completed Date: 1999-03-30 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9010756 Medline TA: J Cardiovasc Electrophysiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 108-13 Citation Subset: IM |
Affiliation:
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Division of Cardiology, University Hospital, Lausanne, Switzerland. etienne.pruvot@hospvd.ch |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Cardiac Pacing, Artificial Electrocardiography* Female Follow-Up Studies Heart Block / etiology*, physiopathology, therapy Humans Long QT Syndrome / complications, congenital*, physiopathology Purkinje Fibers / physiopathology Sympathectomy |
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