Superiority of quantitative exercise thallium-201 variables in determining long-term prognosis in ambulatory patients with chest pain: a comparison with cardiac catheterization. J Am Coll Cardiol 1988;12:25-34. 36. Weiss AT, Berman DS, Lew AS, et al. Transient ischemic dilation of the left ventricle on stress thallium-201 scintigraphy: a …
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Thallium 201 myocardial imaging in conjunction with exercise testing has been demonstrated to improve the predictive value of the ECG alone. Exercise-induced defects in 201 Tl + uptake that fill in with 201 Tl + activity over time seem to represent viable but underperfused or transiently ischemic myocardial segments.
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Abstract. While a normal exercise thallium-201 scan does not exclude coronary artery disease, it may offer important prognostic potential. To determine the long term prognosis in patients with normal thallium scans, the authors studied 118 consecutive patients (80 males, 38 females; age 50 +- 10 years, mean +- 1SD) referred to their laboratory in 1979 …
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@article{osti_5411283, title = {A simplified approach for evaluating multiple test outcomes and multiple disease states in relation to the exercise thallium-201 stress test in suspected coronary artery disease}, author = {Pollock, S G and Watson, D D and Gibson, R S and Beller, G A and Kaul, S}, abstractNote = {This study describes a simplified approach for …
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The present study assessed and compared the diagnostic accuracy of thallium-201 (Tl-201) exercise myocardial single photon emission computerised tomography (SPECT) and dobutamine stress echocardiography (DSE) for detection of coronary artery disease (CAD) in patients with left bundle branch block (LBBB). Study population consisted of 26 …
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In patients undergoing exercise testing, physiologic impairment due to underlying anatomic coronary disease may include exercise-induced ST segment changes, reversible thallium-201 perfusion defects post exercise, or fall in radionuclide left ventricular ejection fraction during bicycle exercise.
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A control group included 26 healthy subjects with normal coronary angiograms, exercise testing and exercise TI-201 SPECT imaging. Exercise TI-201 SPECT results were analyzed with further estimation of the L:H ratios, number and localization of regional perfusion defects, and their mean extent scores expressed in pixels and in per cent of the ...
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To determine the prevalence and clinical significance of increased lung thallium-201 uptake during submaximal exercise myocardial scintigraphy performed 2 weeks after acute myocardial infarction, 61 patients underwent submaximal exercise testing
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• To determine whether normal exercise images can reduce the need for coronary arteriography, we analyzed our data on 102 patients with normal thallium 201 exercise …
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Thirty patients with recurrent symptoms after aortocoronary bypass graft surgery underwent angiography as well as exercise thallium 201 imaging. Exercise imaging has been …
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Thallium-201 myocardial imaging at maximum exercise is reproducible within acceptable limits, but careful attention to exercise technique is essential for valid comparative studies. View Show abstract
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The clinical utility of exercise thallium-201 single photon emission computed tomography was investigated in 360 consecutive patients who had concomitant coronary arteriography. Tomographic images were assessed visually and from computer-quantified polar maps. Sensitivity for detecting coronary artery disease was comparably …
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In this study, the ability of exercise thallium-201 myoca... AbstractAccurate prognostic information is important in determining optimal management of patients presenting for evaluation of chest pain.
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The history of cardiac nuclear medicine dates back to 1973, which marked the introduction of the exercise stress-test myocardial scan by H. William Strauss and the first application of thallium-201 myocardial perfusion imaging by Elliot Lebowitz. Since then, it has been increasingly used in clinical cardiology.
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infarction.'o Thallium-201 single photon emission computed tomography (SPECT) has been shown to provide high diagnostic accuracy for localization of disease by use of maximal stress.2 However, the diagnostic value of submaximal exercise thallium- 201 SPECT in patients who have undergone throm-
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The goal of this study was to determine the prognostic utility of the exercise thallium-201 stress test in ambulatory patients with chest pain who were also referred for cardiac …
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After reading this article, the technologist will be able to describe the properties and uptake mechanism of 201 Tl, the procedure for myocardial perfusion imaging …
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201 Tl imaging; x-ray photopeak; energy window; Monte Carlo simulation; NCAT phantom; Thallium is a metallic element in group IIIA of the periodic table, having biologic properties similar to those of potassium ().This property makes 201 Tl a suitable radioisotope for myocardium, parathyroid gland, and tumor imaging in nuclear medicine (2–5).Myocardial …
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@article{osti_6965225, title = {Exercise thallium-201 scintigraphy in men with nondiagnostic exercise electrocardiograms. Prognostic implications}, author = {Iskandrian, A S and Hakki, A H and Kane-Marsch, S}, abstractNote = {We studied the prognostic value of exercise thallium-201 imaging in 196 men with suspected or known coronary artery …
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Thus, in this study group, there was a rather high prevalence rate of silent ischemia (57%) by exercise thallium-201 criteria. Patients with silent ischemia and those with exercise angina had comparable 1) exercise tolerance and hemodynamics, 2) extent of angiographic coronary artery disease, and 3) extent of exercise-induced hypoperfusion.
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Thallium-201 (Tl-201) is a radiopharmaceutical used for scintigraphy, primarily of the myocardium. The element thallium is treated by the body as an analog of potassium; it is produced in a cyclotron by bombarding thallium-203 with protons.. Characteristics. thallium is a monovalent cation. usually employed in the form of a …
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The effects of two levels of exercise intensity on the size and location of thallium-201 defects were compared in 22 patients with known ischemic coronary artery disease. A symptom-limited incremental exercise test was performed followed (>48 hours) by submaximal steady-state exercise at 70% of the peak heart rate achieved during the ...
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This was investigated in 45 patients during thallium-201 exercise testing. Patients with secondary T wave abnormalities on the resting ECG and ischemic exercise ST segment depression were excluded. On the thallium-201 scans, the left ventricle was divided into anterior-septal and inferior-posterior segments; these were considered equivalent to ...
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Myocardial imaging with intravenous thallium-201 (201Tl) was performed at rest and following maximal treadmill exercise in 101 patients with suspected coronary artery …
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The goal of this study was to determine the prognostic value of a normal exercise thallium-201 (TI-201) scintigram by quantitative criteria in a consecutive series of 349 patients with chest pain. Follow- up was obtained in 345 patients (99%) from 8 to 45 months (mean 34 +/- …
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TID is an abnormal finding in stress myocardial perfusion imaging that suggests severe and extensive CAD and signifies a worse prognosis. TID has been reported with exercise and pharmacologic stress testing, planar and SPECT imaging, and Tl-201, Tc-99m, and dual-isotope protocols. Underlying mechanisms include a combination of stress-induced …
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Increased thallium-201 lung uptake immediately after exercise has been shown (1) to be a marker for extensive coronary artery disease, (2) to correlate with low rest and exercise left ventricular ejection fraction by supine gated blood pool scintigraphy, and (3) to be a powerful independent predicto …
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Exercise electrocardiogram (ECG) has a high rate of false negative results in comparison with simultaneously performed thallium-201 perfusion scintigraphy, particularly in patients with single-vessel coronary artery disease, low exercise workload, inadequate heart rate rise, and resting ECG abnormalities.
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Reverse redistribution (RR) i.e., worsening of images from exercise to redistribution, was noted in 21 (7%) of 300 consecutive thallium-201 (201TI) exercise and redistribution myocardial imaging studies. In 13, there were reversible defects consistent with ischemia in addition to redistribution defects. Twenty RR defects were noted in 15 patients who …
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The aim of this study was to determine the value of myocardial imaging using thallium 201 in differentiating between false-positive and true-positive ECG responses to exercise stress.
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Methods: The efficiency of ICG in detecting myocardial ischemia was compared to treadmill exercise/redistribution thallium-201 scintigraphy. During exercise, patients had simultaneous measurement ...
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The thallium stress test is an imaging study that shows your doctor how well blood flows to your heart. It measures your blood flow during rest and after exercise. The thallium stress test is ...
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Exercise and redistribution thallium-201 imaging is commonly used for the detection and evaluation of left ventricular ischaemia and infarction. The right ventricle is frequently visualised after stress and sometimes on redistribution images. The visualisation of the right ventricle at rest is thought to be abnormal and is suggestive of ...
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Thallium-201 (201 Tl) is the conventional perfusion tracer [4]. 201 Tl behaves like a potassium analog and enters the myocytes through Na + /K + ATPase channels. 201 Tl …
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This study was performed to assess the value of washout rate analysis of quantitative exercise thallium-201 emission computed tomography in vasospastic angina patients without significant coronary stenosis. Quantitative analysis of both thallium-201 perfusion and washout rate before and after drug treatment was performed in 48 patients with ...
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Thallium-201 (201 Tl) is the conventional perfusion tracer [4]. 201 Tl behaves like a potassium analog and enters the myocytes through Na + /K + ATPase channels. 201 Tl is injected intravenously at peak exercise or during pharmacological stress and imaging is started soon after completion of stress. Myocardial segments perfused by narrowed ...
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