Document Detail


Quantification of limited augmentation of myocardial (99m)Tc-tetrofosmin uptake at exercise in stable coronary artery disease.
MedLine Citation:
PMID:  11505203     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We evaluated the diagnostic accuracy of a new method for quantitative analysis of myocardial perfusion at exercise using (99m)Tc-tetrofosmin tomographic imaging. (99m)Tc-tetrofosmin imaging of an exercise-rest sequence was performed in 30 patients with coronary artery disease (CAD) and eight age-matched control subjects. The exercise-induced myocardial count increase was calculated as the relative value (per cent increase ratio, %IR) to that at rest by correcting for physical decay for (99m)Tc and injected doses and by a subtraction technique. Exercise and rest (99m)Tc-tetrofosmin images were assessed visually and quantitatively using the per cent peak count and %IR of the myocardial count at exercise. Segments with significant coronary stenosis (diameter stenosis=75% or more) showed a significantly lower %IR than did those without significant coronary stenosis in the CAD patients (37+/-19% vs 63+/-21%, P<0.05). The diagnostic efficacy of visual analysis for detecting coronary stenosis was as follows: sensitivity, 58.1% and specificity, 81.4%. When %IR=37% was used for detecting significant coronary stenosis, sensitivity and specificity increased to 74.2% and 93.2%, respectively. Furthermore, the quantitative analysis significantly (P=0.04) improved the overall diagnostic accuracy from 73.3% to 86.7% compared to that of visual assessment. Thus, augmentation of myocardial (99m)Tc-tetrofosmin uptake at exercise is blunted in the myocardium with significant coronary stenosis. The calculation of myocardial count increase at exercise relative to that at rest can improve the diagnostic value of (99m)Tc-tetrofosmin SPECT imaging and may contribute to more accurate quantification of myocardial ischaemia and impaired tracer uptake in coronary artery disease.
Authors:
H Sasao; T Nakata; A Hashimoto; T Wakabayashi; T Takahashi; K Miyamoto; K Tsuchihashi; K Shimamoto
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nuclear medicine communications     Volume:  22     ISSN:  0143-3636     ISO Abbreviation:  Nucl Med Commun     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-08-15     Completed Date:  2001-10-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8201017     Medline TA:  Nucl Med Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  955-62     Citation Subset:  IM    
Affiliation:
Second Department of Internal Medicine (Cardiology), Sapporo Medical University School of Medicine, S-1, W-16, Chuo-ku, Sapporo 060-0061, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Coronary Circulation
Coronary Disease / radionuclide imaging*
Exercise*
Female
Heart / radionuclide imaging*
Humans
Male
Middle Aged
Organophosphorus Compounds / diagnostic use*
Organotechnetium Compounds / diagnostic use*
Tomography, Emission-Computed, Single-Photon
Chemical
Reg. No./Substance:
0/Organophosphorus Compounds; 0/Organotechnetium Compounds; 0/technetium Tc 99m 1,2-bis(bis(2-ethoxyethyl)phosphino)ethane

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


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