Quantitative Assessment of Myocardial ^<99m>Tc-sestamibi Uptake During Exercise : Usefulness of Response Rate for Assessing Severity of Coronary Artery Disease
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概要
- 論文の詳細を見る
An increase of ^<99m>Tc-sestamibi uptake in the myocardium during exercise was defined as a response rate, and the feasibility of a response rate for detecting coronary artery disease(CAD)was tested. Eighty-seven patients with suspected CAD had myocardial perfusion imaging with ^<99m>Tc-sestamibi during exercise and at rest. A dose of 370MBq of ^<99m>Tc-sestamibi was injected at the maximal level of exercise, and a myocardial image was obtained 90min later(exercise image). Then, 740MBq of ^<99m>Tc-sestamibi was administered at rest, and myocardial imaging was repeated(rest image). The exercise and rest images were corrected for physical decay and injected doses, and the exercise image was subtracted from the rest image to obtain the corrected rest image. A response rate was calculated as follows:(exercise image-corrected rest image)×100/corrected rest image(%). The global response rates of 20 patients without significant coronary stenosis(≤50%)were higher than those of 67 patients with significant coronary stenosis(81±33% and 50±28%, p<0.01). Global response rates were correlated with the maximal rate pressure products during exercise(r=0.56, p<0.01)and delta rate pressure products(r=0.53, p<0.01). Regional response rates in myocardial areas perfused by stenotic coronary arteries of ≤50%, 75%, 90% and 99-100% were 60±24%^*, 56±33%^*, 40±23%^* and 30±23%^*, respectively, (^*p<0.01 vs without significant coronary stenosis). The response rates decreased as the severity of coronary artery stenosis advanced, and distinguished between coronary stenoses of graded severity. Accordingly, the response rate from myocardial perfusion imaging with ^<99m>Tc-sestamibi may provide complementary information to the conventional inspection with myocardial tomography regarding the severity of CAD.
- 社団法人日本循環器学会の論文
- 1998-07-20
著者
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Takeishi Yasuchika
First department of internal medicine, Fukushima Medical University
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Takeishi Yasuchika
First Department Of Internal Medicine Fukushima Medical University
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Takeishi Yasuchika
The First Department Of Internal Medicine Yamagata University School Of Medicine
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TOMOIKE Hitonobu
First Department of Internal Medicine, Yamagata University School of Medicine, Yamagata, Japan
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Tomoike Hitonobu
The First Department Of Internal Medicine Yamagata University School Of Medicine
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Fujiwara Satomi
First Department of Internal Medicine, Yamagata University School of Medicine
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Atsumi Hiroyuki
First Department of Internal Medicine, Yamagata University School of Medicine
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Chiba Junya
First Department of Internal Medicine, Yamagata University School of Medicine
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Takahashi Kazuei
Division of Radiology, Yamagata University School of Medicine
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Chiba Junya
First Department Of Internal Medicine Yamagata University School Of Medicine
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Takahashi Kazuei
Division Of Radiology Yamagata University School Of Medicine
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Tomoike Hitonobu
First Department Of Internal Medicine Yamagata University Medical School
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Fujiwara Satomi
First Department Of Internal Medicine Yamagata University School Of Medicine
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Atsumi Hiroyuki
The First Department Of Internal Medicine Yamagata University School Of Medicine
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