Biodistribution of Tc-99m methoxy-isobutyl-isonitrile (MIBI) in humans. 1989

A Savi, and P Gerundini, and P Zoli, and L Maffioli, and A Compierchio, and F Colombo, and M Matarrese, and E Deutsch
Department of Nuclear Medicine, Istituto San Raffaele, Milano.

Hexakis (methoxyisobutilisonitrile) technetium(I), 99mTc-MIBI, has been proposed for myocardial perfusion studies. We have evaluated the biodistribution of this new agent in normal volunteers at rest and after stress. The biodistribution of 99mTc-MIBI is characterized by rapid blood clearance and a consequently early myocardial uptake. The initial intense hepatic activity is cleared into the gallbladder at 1 h after injection, and the best target to non target ratio is observed at 60-90 min after injection. Absorbed radiation dose calculations show that the thyroid is the critical target organ (230 mRad/mCi at rest), presumably because of 99mTc-pertechnetate generated in vivo. Our results indicate that 99mTc-MIBI is a promising tracer for myocardial perfusion imaging.

UI MeSH Term Description Entries
D008297 Male Males
D009570 Nitriles Organic compounds containing the -CN radical. The concept is distinguished from CYANIDES, which denotes inorganic salts of HYDROGEN CYANIDE. Nitrile
D011877 Radionuclide Imaging The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph. Gamma Camera Imaging,Radioisotope Scanning,Scanning, Radioisotope,Scintigraphy,Scintiphotography,Imaging, Gamma Camera,Imaging, Radionuclide
D003326 Coronary Circulation The circulation of blood through the CORONARY VESSELS of the HEART. Circulation, Coronary
D006321 Heart The hollow, muscular organ that maintains the circulation of the blood. Hearts
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D014018 Tissue Distribution Accumulation of a drug or chemical substance in various organs (including those not relevant to its pharmacologic or therapeutic action). This distribution depends on the blood flow or perfusion rate of the organ, the ability of the drug to penetrate organ membranes, tissue specificity, protein binding. The distribution is usually expressed as tissue to plasma ratios. Distribution, Tissue,Distributions, Tissue,Tissue Distributions
D015609 Organotechnetium Compounds Organic compounds that contain technetium as an integral part of the molecule. These compounds are often used as radionuclide imaging agents. Compounds, Organotechnetium
D017256 Technetium Tc 99m Sestamibi A technetium imaging agent used to reveal blood-starved cardiac tissue during a heart attack. 99mTc-Hexamibi,99mTc-Sestamibi,Tc MIBI,Cardiolite,Tc-99m-Methoxy-2-isobutylisonitrile,Technetium Tc 99m 2-Methoxy-2-methylpropylisonitrile,Technetium Tc 99m Sestamibi Chloride,Technetium-99m-Hexamibi,Technetium-99m-Sestamibi,99mTc Hexamibi,99mTc Sestamibi,Tc 99m Methoxy 2 isobutylisonitrile,Technetium 99m Hexamibi,Technetium 99m Sestamibi,Technetium Tc 99m 2 Methoxy 2 methylpropylisonitrile

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