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(tēz) [Old English taesan, to pluck] To separate a tissue into minute parts with a needle to prepare it for microscopy.


(tē′spoon″) ABBR: tsp. A household measure equal to approx. 5 mL. Teaspoons used in the home vary from 3 to 6 mL. Because household measures are not accurate, when a teaspoon dose is prescribed or ordered, 5 mL of the substance should be given.


(tēt) 1. The nipple of the mammary gland. SYN: papilla mammae. SEE: breast. 2. Any protuberance resembling a nipple.


[Acronym for Acronym for totally endoscopic coronary artery bypass] A robot-controlled procedure in which the left internal mammary artery is used to bypass the left anterior descending coronary artery without the use of sternotomy. The procedure is a form of minimally invasive coronary artery surgery. In TECAB, several small portholes are made in the chest wall to insert a video camera and robot-controlled and stabilized surgical instruments to improve surgical dexterity and eliminate tremor.


(tek-nē′sh(ē-)ŭm) [Gr. technētikos, made, artificial + -ium (1)] SYMB: Tc. A synthetic, silvery gray, crystalline chemical element, atomic number 43, average atomic weight (mass) 98.9062. It is a transition metal having a number of isotopes, all of which are radioactive and have various half-lives. Its isotope, technetium-99, is used in nuclear medicine for a wide variety of diagnostic tests. SEE: technetium-99m.


(tek-nē′sh(ē-)ŭm-nīn′tē-nīn″) SYMB: 99mTc. A radioactive isotope of technetium having a half-life of 6 hr, in which the "m" means that it is a metastable isotope. 99mTc is used in nuclear medicine for a wide variety of diagnostic tests and imaging studies, e.g., myocardial perfusion scans, bone scans, and V/Q scans.

technetium Tc 99m albumin aggregated injection An injection of technetium-99m that has been aggregated with albumin. It is used intravenously to scan the lungs.

technetium Tc 99m hexamethylpropyleneamine oxime ABBR: HMPAO. A tracer consisting of technetium-99m linked to hexamethylpropyleneamine oxime. It is used to make nuclear imaging scans of the brain, e.g., in the determination of brain death. Absence of uptake of the molecule by the brain is diagnostic of brain death.

technetium 99m (methoxyisonitrile) MIBI A tracer consisting of technetium-99m linked to MIBI. It is used in nuclear medical imaging, e.g., in scintimammography, to identify cancerous breast masses. Other uses of technetium 99m MIBI include cardiac, parathyroid, and thyroid imaging.

technetium Tc 99m methylene diphosphonate A tracer consisting of technetium-99m linked to methylene diphosphonate. It is used in nuclear medicine to obtain images of bone and bone diseases, e.g., fractures not seen on plain x-rays, malignancies, and osteomyelitis.


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