Document Detail

A new method for estimating preexcitation index without extrastimulus technique and its usefulness in determining the mechanism of supraventricular tachycardia.
MedLine Citation:
PMID:  1707219     Owner:  NLM     Status:  MEDLINE    
The preexcitation index has been shown to be useful in determining the mechanism of paroxysmal supraventricular tachycardia (SVT) and the site of the accessory pathway in atrioventricular (AV) reentrant tachycardia. To test whether a preexcitation index could be computed analytically instead of by scanning the whole SVT cycle with extrastimuli, 19 patients with SVT were studied. The new index was computed using the following formula: (AV conduction time during SVT) + (ventriculoatrial conduction time during ventricular pacing at the SVT cycle length) - (SVT cycle length). There was a strong correlation between the preexcitation index determined by the extrastimulus technique and the new index in 15 patients in whom the preexcitation index could be determined (r = 0.99, p less than 0.01). The value on the new index was greater than 90 ms only in patients with dual AV nodal pathways. In the 4 patients in whom the preexcitation index could not be determined by the extrastimulus technique, the new index could differentiate AV reentrant tachycardia (index for 2 patients, 60 and 60 ms, respectively) from AV nodal reentrant tachycardia (index for 2 patients, 100 and 105 ms, respectively). In conclusion, the new index provided help in determining the mechanism of SVT, even when retrograde atrial preexcitation by a ventricular extrastimulus did not occur.
T Yamashita; H Inoue; A Nozaki; T T Kuo; M Usui; S Saihara; T Sugimoto
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  67     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1991 Apr 
Date Detail:
Created Date:  1991-05-03     Completed Date:  1991-05-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  830-4     Citation Subset:  AIM; IM    
Second Department of Internal Medicine, Tokyo University Hospital, Japan.
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MeSH Terms
Atrioventricular Node / physiopathology*
Cardiac Complexes, Premature / physiopathology
Cardiac Pacing, Artificial / methods*
Heart Catheterization / instrumentation
Middle Aged
Pacemaker, Artificial
Refractory Period, Electrophysiological / physiology
Tachycardia, Atrioventricular Nodal Reentry / physiopathology
Tachycardia, Supraventricular / diagnosis,  physiopathology*
Time Factors

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