Document Detail

Significance of the Q wave in acute myocardial infarction.
MedLine Citation:
PMID:  3967404     Owner:  NLM     Status:  MEDLINE    
Acute myocardial infarction may be associated with the development of Q waves on the electrocardiogram (ECG), or with changes limited to the ST segment or T wave. The ECG changes do not accurately differentiate transmural from nontransmural infarction. However, the presence or absence of a Q wave does correlate with some aspects of the clinical course of patients after myocardial infarction, and is therefore of prognostic value. Q-wave infarctions are more likely to be complicated by congestive heart failure during hospitalization. The in-hospital mortality is also higher after a Q-wave infarction than after a non-Q infarction. Both of these findings are probably due to the association of a Q wave with a larger mass of infarcted myocardium. The long-term mortality, however, is the same for Q-wave and non-Q-wave infarctions. This is probably due to an increased late mortality after non-Q infarctions, related in part to a higher rate of reinfarction. The differences between Q-wave and non-Q-wave infarctions are not due to obvious differences in extent and location of coronary artery obstructions. However, there may be differences in the collateral circulation, with more extensive collaterals associated with non-Q infarcts. Appreciation of the prognostic significance of the ECG changes in acute myocardial infarction may help direct the evaluation and management of the patient after myocardial infarction.
R K Goldberg; P E Fenster
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical cardiology     Volume:  8     ISSN:  0160-9289     ISO Abbreviation:  Clin Cardiol     Publication Date:  1985 Jan 
Date Detail:
Created Date:  1985-03-20     Completed Date:  1985-03-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7903272     Medline TA:  Clin Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  40-6     Citation Subset:  IM    
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MeSH Terms
Heart Catheterization
Myocardial Infarction / complications,  mortality,  pathology,  physiopathology*
Time Factors

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

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