Detecting viable myocardium and predicting functional improvement: comparisons of positron emission tomography, rest-redistribution thallium-201 single-photon emission computed tomography (SPECT), exercise thallium-201 reinjection SPECT, I-123 BMIPP SPECT and dobutamine stress echocardiography ...
A possible limitation of intravenously administered perfusion tracers in detecting hibernating myocardium is their poor availability in low-flow areas. We have hypothesized that intracoronary administration might overcome such a limitation. In two patients with a previous anterior myocardial infarction and a severe residual stenosis of the left anterior descending coronary artery, technetium-99m-sestamibi (74 MBq) was selectively injected into the infarct-related coronary artery before successful PTCA. SPECT imaging was carried out 1 hour after the PTCA. In patient 1, evident tracer uptake was detected in the majority of the antero-apical dys-synergic area, previously characterized by a severe irreversible defect (less than 50% of peak activity) at rest-redistribution thallium SPECT (mismatched pattern); in patient 2, no uptake of sestamibi was detected in the dys-synergic area showing a severe irreversible defect (less than 50% of peak activity) at rest-redistribution thallium SPECT, (matched
Hyperchaos is a step towards the X-attractor. The X-attractor is the radically new class of attractors that arises with the fourth dimension (just as chaos arises in the third, oscillation in the second, and steady state in the first). It is still elusive. Hyperchaos (Paul Rapp suggested in 1977 that this name was superior to "superchaos", as I first tended to call it) arises if a 2D cross section through a 3D flow is re-injected (via the fourth dimension) in an expanding manner, expanding in two directions rather than a single one. In other words, it is a straightforward generalization of the reinjection which yields chaos in three dimensions (reinjection, after expansion, back towards the middle of a spiral). Now, it is reinjection towards the tip of an expanding screw. The expanded and folded-over "walking-stick" map in a cross section is hence replaced by a "folded-towel map" (the product of 2 folding-overs). And the former Cantor sets become Julia sets, if you like scary terms. The first ...
OBJECTIVES We sought to ascertain the utility of adenosine thallium-201 tomography for assessing graft stenoses late after coronary artery bypass graft surgery. BACKGROUND Although pharmacologic perfusion imaging has been increasingly used in the assessment of patients with coronary artery disease, the value of this stress modality for detecting coronary artery bypass graft stenosis late after surgery is unknown. METHODS We studied 109 patients who underwent both adenosine thallium-201 tomography and coronary angiography at 6.7 +/- 4.8 (mean +/- SD) years after coronary artery bypass graft surgery. Adenosine thallium-201 tomography was assessed quantitatively by computer-generated polar maps of the myocardial thallium-201 activity. RESULTS On coronary angiography, significant graft stenoses were present in 68 patients, 65 of whom had a corresponding perfusion defect as shown by thallium-201 tomography (sensitivity 96%). Significant stenoses were present in 107 (37.8%) of 283 grafts. The overall
Noninvasive assessment of myocardial viability has proved clinically useful to distinguish hibernating or stunned myocardium from irreversibly injured myocardium in patients with chronic CAD or recent myocardial infarction who exhibit severe regional and global LV dysfunction. A variety of noninvasive methodologies are undergoing investigation and validation for determination of accuracy in the detection of preserved viability in akinetic and severely hypokinetic myocardium. These techniques include SPECT perfusion imaging with 201Tl or one of the new 99mTc-labeled agents, such as 99mTc sestamibi; SPECT imaging of 123I-labeled fatty acid analogs; PET imaging of regional flow and 18F-labeled FDG uptake; and assessment of inotropic reserve by use of dobutamine echocardiography. A major clinical objective when one of these techniques is used in CAD patients with ischemic cardiomyopathy is to identify those who will benefit most from coronary revascularization with respect to postoperative ...
Gilles Barone-Rochette, Mélanie Leclère, Alex Calizzano, Estelle Vautrin, Gallazzini-Crepin Céline, et al.. Stress thallium-201/rest technetium-99m sequential dual-isotope high-speed myocardial perfusion imaging validation versus invasive coronary angiography. Journal of Nuclear Cardiology, Springer Verlag, 2015, 22 (3), pp.513-522. ⟨10.1007/s12350-014-0016-0⟩. ⟨inserm-02440579⟩ ...
The prevalence of a high risk exercise (Ex) Tl-201 (Tl) scintigram (scint) was determined in 295 consecutive patients (pts) with angiographic (angio) (,50% stenosis) coronary artery disease (CAD) and correlated with extent of CAD and Ex stress test findings. A high risk scint by quantitative criteria was defined as either: 1) a typical left main (LM) CAD pattern showing greater than or equal to 25% homogenous disease in Tl activity in septal and posterolateral walls; 2) a multivessel disease (MVD) pattern showing abnormal Tl uptake and/or washout in multiple vascular scan segments; 3) increased lung Tl uptake. The typical LMCAD pattern was observed in 6 of 43 pts (14%) with LMCAD compared to 2% of 53 pts with 3VD (p=0.03), 3% of 99 pts with 2VD (p=0.02) and 2% of 100 pts with 1VD (p-0.01). The MVD scint pattern was seen in 67% of pts with LMCAD compared to 49% (p=0.05) in 3VD pts, 41% (p=0.004) in 2VD pts and 24% (p=,0.0001) in 1VD pts. Prevalence of abnormal lung Tl was comparable in LMCAD ...
Agatha Christie, who worked as a pharmacist, used thallium as the agent of murder in her detective fiction novel The Pale Horse. The first clue to the murder method came from the victims loss of hair.. Dr. Félix-Roland Moumié, a leader of the Cameroonian anticolonial armed struggle against France, was murdered by thallium poisoning on October 15, 1960. A French agent posing as a journalist was the main suspect of this murder.[1]. The 1995 film The Young Poisoners Handbook was based on the activities of Graham Frederick Young, who killed at least three people with thallium in the 1960s and 1970s. Around the same time, an incidence of thallium poisoning was reported in Beijing. The victims classmate asked for help through the Usenet newsgroup, newly established in mainland China at that time. Worldwide news reports covered the ensuing joint efforts by physicians around the world to diagnose the case.. Australian serial killer Caroline Grills was known as "Auntie Thally" for her choice of ...
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Its not often that I come across a method to kill a character in a novel with delightful efficiency and flair, but thallium is one of those chemicals. Thallium is a bluish-white metal that, in pure form, is odorless and tasteless. When combined with chorine, it turns colorless and dissolves well in water. That means…
[65 Pages Report] Check for Discount on thallium nitrate Global Market and Forecast Research report by ChemReport. DescriptionWe provide independent and unbiased information on manufacturers, prices, production...
TY - JOUR. T1 - Myocardial infarct size - thallium 201 perfusion scintigraphy versus enzymatic (CK-MB) estimates. AU - Witztum, K.. AU - Fletcher, James. AU - Lindeman, J.. PY - 1978. Y1 - 1978. UR - http://www.scopus.com/inward/record.url?scp=0018174724&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0018174724&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:0018174724. VL - 58. JO - Circulation. JF - Circulation. SN - 0009-7322. IS - 4 II. ER - ...
The thallium stress test is a technique that can show how well the blood flows to the heart muscle and through the heart when you are exerting yourself and when you are at rest.
Ill be going for a Thallium Stress Test in a couple days. They said it would take 3-4 hours, not to have any caffeine and wear comfortable shoes and clothes. Any other suggestions or tips on what to do? I plan on doing a temporary basal and cutting down by 50% for an hour before and during the test. Rose ---------------------------------------------------------- for HELP or to subscribe/unsubscribe, contact: [email protected] ...
12048-36-1 - JCLGSRAPELTTLY-UHFFFAOYSA-N - Bismuth, compd. with thallium (1:1) - Similar structures search, synonyms, formulas, resource links, and other chemical information.
Author Summary The ability of cells to respond to chemical signals present in the environment is of upmost importance for life. In the developing embryo, cells crawl along graded fields of chemical cues to aggregate into organized patterns. This process is an example of chemotaxis. It is a complex phenomenon, where external signals are transduced into internal chemical pathways leading to directional movement. Differential reorganization of the internal structure is called polarization, and it involves regulatory proteins as well as cytoskeletal elements. In this work, we propose a mathematical and computational model for the quantitative study of chemotactic pathfinding in neural cells. Our starting point is the recent finding that, for such cells, an early polarization event is the redistribution on the membrane of cue-ligated receptors, transported by the cytoskeletal structures, which act as a sort of conveyor belt. We show that this proposed mechanism, connecting in a closed loop cue sensing and
It almost sounds like you are trying to ,, replace the principal of having fill-in ,, digis that respond to WIDE1-1 at low ,, elevations and high WIDEn-N digis... , , This idea was born dead. Not so fast. It was the only way in the USA to allow the construction of FILL-IN digis using the hundreds of thousands of existing available TNCs already in hand and not require the use of a $280 specialized new-N APRS TNC. , Our scheme, where everybody uses WIDE2-2, , and fill-in-digis respond only to packets , from a certain geographical region, works far better. Yes, it is slightly better because the length of each packet is shorter without having to carry the initial WIDE1-1. And it is the best solution, if people are willing to buy all-new hardware for fill-in digis. It is good to hear that your country is able to do this. We should be able to slowly migrate that direction now that many innexpensive new-N TNC digipeaters are available. But for years, users will still have to use the path of WIDE1-1 ...
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Study Objective: To determine whether clinical markers and preoperative dipyridamole-thallium imaging are both useful in predicting ischemic events after vascular surgery.. Design: Retrospective, observational study.. Setting: University medical center.. Patients: Two hundred fifty-four consecutive patients referred to a nuclear cardiology laboratory before surgery. Forty-four patients had surgery cancelled or postponed after clinical evaluation and dipyridamole-thallium imaging. Surgery was not confirmed for ten. Two hundred patients receiving prompt vascular surgery were the study group.. Measurements and Main Results: Thirty patients (15%) had early postoperative cardiac ischemic events, with cardiac death in 6 (3%) and nonfatal myocardial infarction in 9 (4.5%). Logistic regression identified five clinical predictors (Q waves, history of ventricular ectopic activity, diabetes, advanced age, angina) and two dipyridamole-thallium predictors of postoperative events. Of patients with none of the ...
Objectives. We sought to evaluate the clinical use and cost-analysis of acute rest technetium-99m (Tc-99m) tetrofosmin single-photon emission computed tomographic (SPECT) myocardial perfusion imaging in patients with chest pain and a normal electrocardiogram (ECG).. Background. Current approaches used in emergency departments (EDs) for treating patients presenting with chest pain and a nondiagnostic ECG result in poor resource utilization.. Methods. Three hundred fifty-seven patients presenting to six centers with symptoms suggestive of myocardial ischemia and a nondiagnostic ECG underwent Tc-99m tetrofosmin SPECT during or within 6 h of symptoms. Follow-up evaluation was performed during the hospital period and 30 days after discharge. All entry ECGs, SPECT images and cardiac events were reviewed in blinded manner and were not available to the admitting physicians.. Results. By consensus interpretation, 204 images (57%) were normal, and 153 were abnormal (43%). Of 20 patients (6%) with an acute ...
Thallium-201 SPECT has been proposed as a method for assessment of malignancy grade in gliomas.3-7 There is a selective uptake of 201Tl in highly malignant glioma cells. The mechanism behind intracellular Tl uptake is probably an active transport by less selective ion channels in malignantly transformed glial cells.19-21 The cellular uptake is not solely related to cell biology in the tumour. The uptake is multifactorial, depending also on blood flow in the tumour, extent of pathological vessel invasion, and extent of blood-brain barrier breakdown.. In a recent study we evaluated the accuracy in preoperative glioma malignancy grading on the basis of 201Tl uptake indices, CT findings, and histopathology.22 We found a significant correlation between CT enhancement volumes and 201Tl uptake indices in high grade gliomas. Uptake of 201Tl in non-enhancing gliomas was very low, independent of tumour malignancy grade. A disrupted blood-brain barrier seems to be a prerequisite for intracerebral ...
Tl2SO4 - THALLIUM (I) SULPHATE. Reactions with Thallium (I) sulphate Tl2SO4 Obtaining Thallium (I) sulphate Tl2SO4. Properties: hydrolysis, soluble in dilute sulfuric acid, decomposed ...
Get information, facts, and pictures about thallium at Encyclopedia.com. Make research projects and school reports about thallium easy with credible articles from our FREE, online encyclopedia and dictionary.
Thallium (af græsk θαλλός, thallos, dvs. "en grøn kvist")[7] blev opdaget i 1861 ved hjælp af flammespektroskopi.[8] Navnet skyldes thalliums klare grønne spektrallinje.[9] Efter offentliggørelsen af en forbedret flammespektroskopi-metode udviklet af Robert Bunsen og Gustav Kirchhoff[10] og opdagelsen af cæsium og rubidium i hhv. 1859 og 1860 blev flammespektroskopi en anerkendt metode til bestemmelse af mineralers og kemiske produkters bestanddele. William Crookes og Claude-Auguste Lamy begyndte begge at bruge metoden. Crookes benyttede den til at undersøge selenforbindelser fra blykammeret på en svovlsyrefabrik ved Abberode i Harzen for tellur. Prøverne til sine undersøgelser af selencyanid havde han modtaget nogle år forinden.[11][12] I 1862 lykkedes det Crookes at isolere små mængder af det nye grundstof thallium og måle egenskaberne for nogle af dets forbindelser.[13] Claude-Auguste Lamy benyttede et spektrometer magen til Crookes til at bestemme indholdet af en ...
Recent advances in nuclear myocardial perfusion imaging (MPI) have made it possible to develop a dual-isotope protocol for high-speed acquisition with image quality and radiation delivery comparable to that obtained with conventional single isotope p
sir Stress thalium test result shows the following results:- SA.HLA & VLA section taken post stress and during rest reveal -no stress indused I.V.dilation. - reversible perfusion defect in anterior...
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ESPI High Purity Metal Specialists since 1950 with a company mission to provide a reliable resource for researchers high purity metals, metal compounds and metal alloys for all major universities, international and domestic manufacturing companies and corporate R&D laboratories worldwide, as well as most U.S. government research laboratories. Also manufacturer of DeContam®, an aggressive water based, non-hazardous cleansing agent specifically formulated for the electronic, aerospace and nuclear industries.
ESPI High Purity Metal Specialists since 1950 with a company mission to provide a reliable resource for researchers high purity metals, metal compounds and metal alloys for all major universities, international and domestic manufacturing companies and corporate R&D laboratories worldwide, as well as most U.S. government research laboratories. Also manufacturer of DeContam®, an aggressive water based, non-hazardous cleansing agent specifically formulated for the electronic, aerospace and nuclear industries.
To see a rotating video of (almost) any of the samples of Thallium from The Elements, click it below. Links will open in a new window ...
Thallium iii acetate, or thallous acetate, is used in microbiology as a selective growth mediumngraded products supplied by spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use.
Thallium is released into the biosphere from both natural and anthropogenic sources. It is generally present in the environment at low levels; however, human activity has greatly increased its...
Dr. Hurwitz would like the scope of our study to be broader. Our study was designed to address a specific issue-the identification of three-vessel or left-main disease in patients with a normal resting electrocardiogram who had exercise testing. This particular scenario in exercise electrocardiography can be expected to be at its best (yielding interpretable ST segments in the setting of severe disease), whereas thallium-201 scintigraphy is not (a relative perfusion technique where abnormalities in all three territories occur in less than one third of patients with three-vessel disease) [1]. We agree that there are many other useful applications of perfusion imaging in which Bayesian principles are used. However, we feel that it is important to determine in which cases such technology is effective and in which cases similar performance can be provided at less expense ...
Spontaneous slip on frictional interfaces involves both short-lived inertially-driven events and long-term quasi-static sliding. An example of considerable practical importance is the response of faults in the Earths crust to tectonic loading. The response combines earthquakes that cause destructive ground motions and aseismic slip. Numerical models are needed to study the physics and mechanics of such complex behavior. In part, the models can help understand the observed slip patterns and interpret them in terms of constitutive properties of rocks determined in the lab. This thesis contains two main contributions. The first one is the development and implementation of a 3D methodology for simulations of spontaneous long-term interface slip punctuated by rapid inertially driven ruptures. Our approach is the first one to combine long-term deformation histories and the resulting stress redistribution on faults with full inclusion of inertial effects during simulated earthquakes in the context of ...
Covers every aspect of evaluation and treatment of patients who suffer from chronic coronary syndromes. Provides both evidenced based recommendations from the most recent guidelines from the major cardiology societies: AHA, ACC, and ESC, as well as prac
Your question is a very good one, and deserves a thoughtful answer. Ill try to give you that. While your symptoms at present are not the same as what you felt before and during your heart attack, and while it is possible to have pain (not muscle pain necessarily, but sometimes nerve pain) for this long post CABG, it seems to me at least suspicious enough to warrant a thallium scan stress test (unless thats what you had -- you only mention stress test as in stress test, plain). A plain stress test is not nearly as useful as one with nuc scan, and is still less invasive than an angiogram. If your doctor isnt willing to go the half-step to do this and clear the air, then I guess either a second opinion or an angiogram are your two best alternatives, because what you describe would raise some flags for me, especially in a woman, since women usually do have atypical cardiac pain, as opposed to men, whose classic pattern dominates all the textbooks. The reason for that is that for ages men were ...
a p , 0.05 versus baseline. Data are expressed as mean value ± SD. DBP = diastolic blood pressure; HR = heart rate; RPP = rate-pressure product; SBP = systolic blood pressure. ...
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トレッドミル運動負荷断層タリウム心筋シンチグラフィ(^,201,Tl-SPECT)による6年間の心疾患長期予後の検討 Prediction of 6-year Prognosis for Cardiac Event by Thallium-201 Single-Photon Emission Computed Tomography(SPECT) with Treadmill Exercise Test ...
Hi: I had a thallium stress test done and found that I had a blockage. I saw a cardiologist who informed me that by what he views on the pictures from the thallium stress test and that I did re...
The scientists tested the thallium concentrations in the dogs hair, and found that there were 8.2 µg/g in samples taken on day 19. The thallium concentration increased to 16.4 µg/g 3 months after exposure, and then slowly decreased to 13.4 µg/g in the fifth month, and finally nondetectable 7 months after exposure ...
Ions of the element thallium, introduced into a solution outside the model cells, help the researchers with this process. When the thallium ions reach the inner part of the model cells, they extinguish the fluorescent glow. This usually happens very slowly, but when two gramicidins pair up along the lipid bilayer, they form channels that help ions cross the membrane and quickly dim the glow ...
This Lithuanian entry was created from the translations listed at thallium. It may be less reliable than other entries, and may be missing parts of speech or additional senses. Please also see talis in the Lithuanian Wiktionary. This notice will be removed when the entry is checked. (more information) August 2010. ...
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Please put your name below if youre interested in attending. Cutoff date for deciding the sprint dates is 23rd May 2020, please fill-in your availability for dates in between 1-15 June before deadline. Keep list alphabetically sorted. ...
Please put your name below if youre interested in attending. Cutoff date for deciding the sprint dates is 23rd May 2020, please fill-in your availability for dates in between 1-15 June before deadline. Keep list alphabetically sorted. ...