Document Detail

Enhanced detection of arrhythmia vulnerability using T wave alternans, left ventricular ejection fraction, and programmed ventricular stimulation: a prospective study in subjects with chronic ischemic heart disease.
MedLine Citation:
PMID:  15028046     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: In previous studies, the prognostic value of T wave alternans (TWA) was similar to that of programmed ventricular stimulation (PVS). However, presently it is unclear if TWA and PVS identify the same patients or provide complementary risk stratification information. In addition, the effects of left ventricular ejection fraction (LVEF) on the prognostic value of TWA are unknown. The aim of this study was to determine if combined assessment of TWA, LVEF, and PVS improves arrhythmia risk stratification. METHODS AND RESULTS: This was a prospective study of 144 patients with coronary artery disease and LVEF < or =40% who were referred for PVS for standard clinical indications. The endpoint was the combined incidence of death, sustained ventricular arrhythmias, and appropriate implantable cardioverter defibrillator (ICD) therapy. TWA (hazard ratio 2.2, P = 0.03) and PVS (hazard ratio 1.9, P = 0.05) both were significant predictors of endpoint events, and TWA was the only independent predictor. LVEF markedly influenced the prognostic value of TWA, which was a potent predictor of events in subjects with LVEF between 30% and 40% (event rates: TWA+ 36%, TWA- 0%, P = 0.001) but did not predict events in subjects with LVEF <30% (hazard ratio 1.1, P > 0.5). PVS successfully identified additional low-risk patients within the cohort with negative or indeterminate TWA results (hazard ratio 4.7, P = 0.015) but did not provide incremental prognostic information for TWA+ patients (hazard ratio 0.9, P > 0.5). CONCLUSION: The combined use of TWA, LVEF, and PVS is a promising new approach to arrhythmia risk stratification that permits identification of high-risk and very-low-risk patients.
Eric J Rashba; Ahmed F Osman; Karen Macmurdy; Malcolm M Kirk; Samantha E Sarang; Robert W Peters; Stephen R Shorofsky; Michael R Gold
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cardiovascular electrophysiology     Volume:  15     ISSN:  1045-3873     ISO Abbreviation:  J. Cardiovasc. Electrophysiol.     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-03-18     Completed Date:  2004-11-06     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9010756     Medline TA:  J Cardiovasc Electrophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  170-6     Citation Subset:  IM    
Division of Cardiology, Department of Medicine, University of Maryland at Baltimore, Baltimore, Maryland 21201, USA.
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MeSH Terms
Arrhythmias, Cardiac / diagnosis*,  epidemiology,  physiopathology*,  therapy
Chronic Disease
Defibrillators, Implantable
Disease-Free Survival
Electrophysiologic Techniques, Cardiac
Endpoint Determination
Follow-Up Studies
Heart Rate / physiology*
Middle Aged
Multivariate Analysis
Myocardial Ischemia / diagnosis,  epidemiology,  physiopathology,  therapy
Postoperative Complications / epidemiology,  etiology,  physiopathology
Predictive Value of Tests
Prospective Studies
Risk Factors
Stroke Volume / physiology*
Treatment Outcome
Ventricular Function, Left / physiology*
Comment In:
J Cardiovasc Electrophysiol. 2004 Feb;15(2):177-8   [PMID:  15028047 ]

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