Document Detail

Electrocardiography and postextrasystolic potentiation: utilization of the two methods to predict postrevascularization segmental myocardial function.
MedLine Citation:
PMID:  1707355     Owner:  NLM     Status:  MEDLINE    
We previously reported that postextrasystolic potentiation (PESP) is a useful predictor of changes in systolic wall function (SWF) following coronary revascularization. In the current study we analyzed ECG changes related to corresponding myocardial segments to determine their correlation with PESP and SWF. We found: (1) The PESP response in a jeopardized segment was a valid predictor of improved SWF even when Q waves, ST-segment changes, or T-wave changes were present. (2) However, when Q waves were present in two or more of the corresponding leads, positive PESP was less likely to be observed. (3) Thus Q waves in two leads predicted the least postrevascularization improvement. (4) Segments with no corresponding Q-wave postrevascularization usually improved SWF. (5) Furthermore, a continuum of responsiveness to PESP was found, ranging from T-wave changes, ST-segment changes to Q-wave changes, indicating dissociation between electrical and mechanical events. In conclusion, the ECG together with PESP provide good predictive information relative to the efficacy of revascularization. PESP is a more valuable predictive indicator. ECG alone may be of value in that the occurrence of Q waves in two or more corresponding leads predicts a low probability of improved SWF. Further studies are indicated to investigate the dissociation between electrical and mechanical events.
M W Cooper; R Mitchell; L O Lutherer; R Lust
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Clinical cardiology     Volume:  14     ISSN:  0160-9289     ISO Abbreviation:  Clin Cardiol     Publication Date:  1991 Mar 
Date Detail:
Created Date:  1991-05-10     Completed Date:  1991-05-10     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7903272     Medline TA:  Clin Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  243-8     Citation Subset:  IM    
Texas Tech University Health Science Center, Lubbock.
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MeSH Terms
Blood Pressure / physiology
Cardiac Complexes, Premature
Cardiac Pacing, Artificial / methods*
Electrocardiography* / instrumentation,  methods
Heart Catheterization
Heart Ventricles / radiography
Myocardial Contraction
Myocardial Revascularization*
Single-Blind Method
Ventricular Function / physiology*

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

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