Document Detail

Usefulness of the Poincaré maps in detection of T-wave alternans in precordial leads of standard ECG--a comparison with the spectral method.
MedLine Citation:
PMID:  11386028     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: T-wave alternans (TWA) at microvolt level is considered as an important non-invasive risk factor for sudden death. Several methods are used to measure such repolarization variations, but each of them has some limitations. The purpose of our study is to assess the usefulness of Poincaré maps, a method based on nonlinear dynamics theory, in detection of repolarization abnormalities. MATERIAL AND METHODS: In 30 postinfarction patients presence of TWA in precordial ECG leads was assessed by the spectral method (SM) and by the Poincaré maps (PM). Quantitative measures of both methods: alternans voltage (AV) and alternans distance (AD) were compared using linear regression. RESULTS: Significant correlation between both measures (r = 0.92, p < 0.01) was found. The value of AD > or = 10 microV was accepted as significant for the presence of T-wave alternans. CONCLUSIONS: Poincaré mapping seems to be a useful and simple method for detection of TWA. The alternans distance equal or greater than 10 microV can be considered as a level determinative for the presence of TWA.
J Ruta; P Strumiłło
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Medical science monitor : international medical journal of experimental and clinical research     Volume:  7     ISSN:  1234-1010     ISO Abbreviation:  Med. Sci. Monit.     Publication Date:    2001 May-Jun
Date Detail:
Created Date:  2001-06-01     Completed Date:  2001-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9609063     Medline TA:  Med Sci Monit     Country:  Poland    
Other Details:
Languages:  eng     Pagination:  471-6     Citation Subset:  IM    
Department of Cardiology, Institute of Cardiology, Medical University, ul. Sterlinga 1/3, 91-425 Łódź, Poland.
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MeSH Terms
Death, Sudden / etiology*
Electrocardiography / methods*
Heart Rate
Middle Aged
Models, Theoretical
Myocardial Infarction / pathology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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