Document Detail

Electrophysiological characteristic of a patient exhibiting the short-coupled variant of torsade de pointes.
MedLine Citation:
PMID:  11455519     Owner:  NLM     Status:  MEDLINE    
A 41-year-old man was admitted because of syncope. The electrocardiogram showed torsade de pointes (Tdp) with no long QT interval and the coupling interval of the initial beat of Tdp was 240 ms. Heterogeneity of ventricular refractoriness was observed together with shortness of the effective refractory period measured at the right ventricular inflow site where the paced QRS morphology was the same as that of the initial beat of Tdp. Verapamil could suppress frequent ventricular premature complexes with a short coupling interval, which lead to Tdp. Polymorphic ventricular tachycardia was induced by triple ventricular extrastimuli. A pure potassium channel blocker was successful in inhibiting polymorphic ventricular tachycardia inducibility by prolongation of refractoriness. These results suggested that triggered ventricular premature complexes may be represent the initiating mechanism, whereas the shortness of local refractory period and heterogeneity of ventricular refractoriness may play a role in the development and the maintenance of the Tdp.
T Shiga; M Shoda; N Matsuda; Y Fuda; N Hagiwara; S Ohnishi; A Watanabe; H Kasanuki
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  34     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  2001 Jul 
Date Detail:
Created Date:  2001-07-16     Completed Date:  2001-09-13     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  271-5     Citation Subset:  IM    
Department of Cardiology, The Heart Institute of Japan, Tokyo Women's Medical University, Tokyo, Japan.
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MeSH Terms
Anti-Arrhythmia Agents / pharmacology
Electrophysiologic Techniques, Cardiac
Heart Conduction System / physiopathology*
Torsades de Pointes / diagnosis,  physiopathology*
Ventricular Premature Complexes / diagnosis,  physiopathology*
Reg. No./Substance:
0/Anti-Arrhythmia Agents

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