Abstract | BACKGROUND: The extent of Q wave 'burden' on electrocardiograms (ECGs) has not been correlated with the extent of scarring and hibernation as determined quantitatively by positron emission tomography (PET). OBJECTIVE: A retrospective study was performed to identify if ECG Q wave burden predicts the extent of scarring or mismatch (hibernating myocardium) as defined by rubidium-82/ F-18 fluorodeoxyglucose PET viability imaging. PATIENTS AND METHODS: Eighty-three consecutive patients with coronary artery disease undergoing rubidium-82/F-18 fluoro- deoxyglucose viability imaging (mean age 67.9+/-11 years, with a mean ejection fraction of 27+/-7%) formed the study population. Resting ECG was interpreted for the presence or absence of Q waves using standard ECG criteria for Q wave myocardial infarction. Patients were divided into two groups based on their Q wave burden on ECG (small to moderate scar: zero to four Q waves; large scar: five or more Q waves). Automated analysis was used to calculate the extent of scarring and mismatch (hibernating myocardium) on PET as a percentage of left ventricular myocardium. Mean PET scar and mismatch scores were calculated for the two groups. RESULTS: The mean PET scar scores were significantly different between the small to moderate ECG scar group (13.9+/-7.3% of the left ventricle) and the large scar group (20.6+/-8.1% of the left ventricle; P=0.001). The mismatch scores for the small to moderate scar group (4.6+/-2.8%) were not significantly different from those of the large scar group (4.05+/-2.8%; P=0.7). CONCLUSIONS: ECG Q wave 'burden' was associated with the presence of scars as defined by PET but did not accurately predict the amount of hibernating myocardium.
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Authors | Karthikeyan Ananthasubramaniam, Benjamin J W Chow, Terrence D Ruddy, Robert deKemp, Ross A Davies, Jean DaSilva, Rob S B Beanlands |
Journal | The Canadian journal of cardiology
(Can J Cardiol)
Vol. 21
Issue 1
Pg. 51-6
(Jan 2005)
ISSN: 0828-282X [Print] England |
PMID | 15685303
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Topics |
- Age Factors
- Aged
- Cicatrix
(pathology)
- Electrocardiography
- Female
- Follow-Up Studies
- Humans
- Male
- Middle Aged
- Myocardial Infarction
(diagnostic imaging, pathology)
- Myocardium
(pathology)
- Positron-Emission Tomography
- Predictive Value of Tests
- Retrospective Studies
- Risk Assessment
- Sampling Studies
- Sensitivity and Specificity
- Severity of Illness Index
- Sex Factors
- Tissue Survival
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