| thallium s. |
see thallium-201 myocardial perfusion scintigraphy, under scintigraphy, and thallium stress test, under test.
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| thallium stress t. |
(for detection of coronary artery disease): stress is placed on the cardiovascular system by exercising the patient on a treadmill or bicycle ergometer and thallous chloride Tl-201 is injected intravenously when stress is maximal, just prior to exercise cessation. Immediate (stress) and delayed (redistribution) images are obtained with a gamma camera (see thallium-201 myocardial perfusion scintigraphy); then abnormalities of radionuclide distribution and redistribution are assessed, compared with electrocardiograms obtained during exercise, and used to diagnose areas of ischemia and coronary artery disease. In patients incapable of exercise, stress is induced by injection of dipyridamole or adenosine.
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| thallium-201 myocardial perfusion s. |
the most common type of myocardial perfusion scintigraphy; the radionuclide used is thallium 201 in the form of thallous chloride. It is most frequently performed in conjunction with exercise stress tests in the diagnosis of coronary artery disease, but is sometimes performed on resting patients to detect transient ischemia or myocardial infarction. See also thallium stress test, under test.
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| thallitoxicosis |
Thallium poisoning. SEE: thallium in Poisons and Poisoning Appendix.
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