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a chemical element, atomic number 81, atomic weight 204.37, symbol Tl. (See Appendix 6.) Its salts are active poisons that may cause alopecia, liver and kidney damage, blindness, and neurologic and psychic symptoms such as ataxia, restlessness, delirium, hallucinations, delusions, and semicoma.
thallium 201 a radioactive isotope of thallium having a half-life of 3.05 days and decaying by electron capture with emission of gamma rays. It is used as a diagnostic aid in the form of thallous chloride Tl 201.
thallium scan a scintiscan involving the use of thallium 201. The radioisotope is administered intravenously and localizes, like calcium, in the myocardium. A scintillation camera produces an image of the distribution of the radioisotope. Areas of inadequate perfusion appear as “cold spots,” thus pinpointing the site of occlusions of the coronary arteries.

The thallium scan offers many advantages. It is noninvasive except for the administration of the radioisotope, which involves a radiation dose slightly larger than that received during a chest x-ray, and is extremely accurate.

The thallium-201 may be administered while the patient is exercising on a treadmill and being monitored by electrocardiogram. Subsequent scintigrams show areas of inadequate perfusion. This test is less likely than conventional exercise or stress testing to indicate disease when none is present and is more likely to detect disease when it is present. See also exercise thallium scintigraphy and myocardial perfusion scintigraphy.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Symbol for thallium.
Farlex Partner Medical Dictionary © Farlex 2012


Symbol for thallium
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Over all, TLS was found in 57 (62.6%) children with ALL either spontaneously or after induction chemotherapy.
(15,17,18) Xanthine levels are not routinely measured, and the incidence of xanthine nephropathy and its contribution to acute renal injury in TLS are unknown.
In operation since 1996, TLS Veterans' mission is to provide veterans in need and their families the services necessary to experience hope and achieve success.
The sample size was calculated using Openepi software with assumed prevalence of TLS being 11.6%, and confidence limits being 4%.19 The required sample size was 247.
If no response message is received the TLS connection is terminated.
Some students and teachers, however, had already been coping with the help of TLS.
* Why use TLS over JSON in RESTful, when DTLS is available?
There are different versions of TLS, but the oldest is TLS 1.0.
TLS is most commonly seen during the initiation of chemotherapy in aggressive hematologic malignancies, such as acute myeloid leukemia, acute lymphoblastic leukemia, and non-Hodgkin's lymphoma [3].
Final diagnosis was spontaneous TLS caused by DEAC of the uterus.
Tumor lysis syndrome (TLS) is a metabolic complication that may follow the initiation of cancer therapy.
Feedback from the local deaf community has helped the Trust to select Topp Language Solutions (TLS) to work with its hospitals.