Document Detail


Analysis of discrepancies between VCG and ECG interpretation of anterior wall myocardial infarction.
MedLine Citation:
PMID:  858977     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In 247 cases in which an old anterior myocardial infarction (MI) was suspected and in which SVEC III-lead system vectorcardiograms (VCGs) and matching conventional 12-lead electrocardiograms (ECGs) were available, records were analyzed to investigate the diagnostic agreement or discrepancy between the two techniques. The frequency of agreement (155 cases) exceeded the frequency of disagreement (92 cases), but the frequency of disagreement even with lumped subgroups was high. Eighty percent of this disagreement was between positive VCG and negative ECG diagnostic consensus. The positive MI group by ECG diagnosis showed smaller R waves and larger S waves and larger S waves in leads V2 and V3 and smaller R/S ratios in leads V2 and V4 than the negative MI groupe by ECG, while small R waves or QS patterns and large S waves in just lead V1 were the only positive finding in the positive MI group by VCG. The important VCG characteristic for positive MI diagnosis was abnormal posterior deviation of the initial QRS vectors. The high incidence of discrepancies shown by positive VCG and negative ECG diagnoses resulted from the fact that, in spite of the presence of a fairly well developed R wave in precordial leads, the initial QRS vectors were displaced posteriorly. In 8 of 18 cases classified into negative VCG and positive ECG diagnostic group, poor R wave progression did not necessarily result in the posterior displacement of the initial QRS vectors. In contrast to the difficulties in applying ECG criteria for anterior MI (variability of QRS patterns in precordial leads), an orthogenal VCG (representing the phasic changes in the depolarization process) seems to clarify the equivocal situation in the ECG diagnosis of MI.
Authors:
K Yamauchi; M Segal; H Tatematsu; E Simonson
Related Documents :
8234777 - Electrocardiographic changes associated with acute cerebrovascular disease: a clinical ...
1919387 - Giant t waves simulating apical hypertrophic myocardiopathy that disappear with sodium ...
8335597 - Personal computer system for tracking cardiac vulnerability by complex demodulation of ...
10829697 - Onset of pulsatile waves in the heart walls at end-systole.
1941047 - Interventions to support the failing right ventricle.
2887097 - Efficacy of nifedipine and metoprolol in the early treatment of unstable angina in the ...
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  10     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  1977 Apr 
Date Detail:
Created Date:  1977-06-30     Completed Date:  1977-06-30     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  171-8     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Electrocardiography*
Female
Humans
Male
Methods
Myocardial Infarction / diagnosis*
Vectorcardiography*

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


Previous Document:  High fidelity ECG in the diagnosis of occult coronary artery disease: a study of patients with norma...
Next Document:  Bi-morphic atrial flutter.