Document Detail

Static relationship of cycle length to reentrant circuit geometry.
MedLine Citation:
PMID:  11602499     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Knowledge of the pathway common to both wave fronts in figure-8 reentrant circuits (ie, the isthmus) is of importance for catheter ablation to stop reentrant ventricular tachycardia. It was hypothesized that quantitative measures of reentry isthmus geometry were interrelated and could be correlated with tachycardia cycle length. METHODS AND RESULTS: A canine infarct model of reentrant ventricular tachycardia in the epicardial border zone with a figure-8 pattern of conduction was used for initial analysis (experiments in 20 canine hearts with monomorphic reentry). Sinus-rhythm and reentry activation maps were constructed, and quantitative (skeletonized) geometric parameters of the isthmus and border zone were measured from the maps. Regression equations were used to determine significant correlation relationships between skeletonized variables, which can be described as follows. Tachycardia cycle length, measured from the ECG R-R interval, increases with increasing isthmus length, width, narrowest width, angle with respect to muscle fibers, and circuit path length determined by use of sinus-rhythm measurements. After this procedure, in 5 test-set experiments, tachycardia cycle length measured from the R-R interval, in combination with regression coefficients calculated from initial experiments, correctly predicted isthmus geometry (mean estimated/actual isthmus overlap 70.5%). Also, the circuit path length determined with sinus-rhythm measurements correctly estimated the tachycardia cycle length (mean error 6.2+/-2.5 ms). CONCLUSIONS: Correlation relationships derived from measurements using reentry and sinus-rhythm activation maps are useful to assess isthmus geometry on the basis of tachycardia cycle length. Such estimates may improve catheter ablation site targeting during clinical electrophysiological study.
E J Ciaccio; C Costeas; J Coromilas; A L Wit
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  104     ISSN:  1524-4539     ISO Abbreviation:  Circulation     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2001-10-16     Completed Date:  2001-12-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1946-51     Citation Subset:  AIM; IM    
Department of Pharmacology, Center for Molecular Therapeutics, College of Physicians and Surgeons, Columbia University, New York, NY, USA.
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MeSH Terms
Body Surface Potential Mapping
Catheter Ablation / methods
Disease Models, Animal
Electrophysiologic Techniques, Cardiac*
Heart Conduction System / physiopathology*
Heart Rate*
Membrane Potentials
Myocardial Infarction / complications,  physiopathology*
Tachycardia, Ventricular / complications,  physiopathology*
Grant Support

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