Abstract
Technetium(2-ethoxy-2-methyl-1-isocyanopropane)6+, [Tc-EIBT] is a complex of technetium(I) structurally similar but slightly more lipophilic than the commercial myocardial perfusion agent Cardiolite [Tc-MIBI]. Tc-EIBI exhibits rapid extraction from the blood into heart, liver, kidney and striated muscle and rapid hepatobiliary clearance. In the guinea pig, unlike Tc-MIBI, this compound is almost completely enzymatically metabolized to numerous cationic complexes containing a mixture of ethyl other and hydroxy isonitrile ligands. Substitution of the ethyl other group for a methyl ether produces an agent that shows selective in vivo metabolism and more rapid clearance from the liver.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Chromatography, High Pressure Liquid
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Guinea Pigs
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Male
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Myocardium / metabolism
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Nitriles / metabolism*
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Nitriles / pharmacokinetics
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Organotechnetium Compounds / metabolism*
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Organotechnetium Compounds / pharmacokinetics
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Perfusion
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Rabbits
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Radiopharmaceuticals / metabolism*
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Radiopharmaceuticals / pharmacokinetics
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Rats
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Rats, Inbred Strains
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Spectrometry, Mass, Fast Atom Bombardment
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Technetium Tc 99m Sestamibi / metabolism
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Technetium Tc 99m Sestamibi / pharmacokinetics
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Tissue Distribution
Substances
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Nitriles
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Organotechnetium Compounds
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Radiopharmaceuticals
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technetium Tc 99m ethoxyisobutylisonitrile
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Technetium Tc 99m Sestamibi