Faculty Collaboration Database

Evaluation of 99Tcm-bicisate as a renal imaging agent. Nucl Med Commun 1997 Aug;18(8):771-5

Date

08/01/1997

Pubmed ID

9293508

DOI

10.1097/00006231-199708000-00011

Scopus ID

2-s2.0-0030612136 (requires institutional sign-in at Scopus site)   5 Citations

Abstract

99Tcm-bicisate (99Tcm-ECD), often used as a brain perfusion agent, is rapidly converted following intravenous injection to the polar monoacid (99Tcm-ECM) and diacid (99Tcm-EC) metabolites. Such polar metabolites, which are eliminated principally by renal clearance, are potential renal imaging agents. In this study, 99Tcm-ECD was compared for the first time with 99Tcm-EC, 99Tcm-mercaptoacetyltriglycine (99Tcm-MAG3) and 131I-orthoiodohippurate (OIH) as renal imaging agents in rabbits. Whole-body images and renograms were obtained for all three of the 99Tcm agents, and pharmacokinetic parameters including plasma and urinary clearance were studied for all four agents. The plasma clearance of 99Tcm-EC (37 ml min-1) was slower than that of 99Tcm-ECD (51 ml min-1), which could be accounted for by the higher liver uptake of 99Tcm-ECD. The urinary clearance of 99Tcm-ECD (35 ml min-1), 99Tcm-EC (34 ml min-1) and 99Tcm-MAG3 (39 ml min-1) was similar. The renal images obtained with 99Tcm-ECD were comparable to those for 99Tcm-MAG3 and 99Tcm-EC. However, liver uptake was more prominent with 99Tcm-ECD than with the other agents. The 99Tcm-ECD renogram curves showed a prolonged decrease in renal activity compared to both 99Tcm-EC and 99Tcm-MAG3. In potential human studies, the relatively high liver uptake of 99Tcm-ECD superimposed on right renal activity may be a limitation. Therefore, we conclude that 99Tcm-ECD is less favourable when compared to existing renal agents due to its high extrarenal uptake and renal kinetics.

Author List

Ozker K, Kabasakal L, Liu Y, Hellman RS, Isitman A, Krasnow AZ, Collier BD

MESH terms used to index this publication - Major topics in bold

Animals
Biotransformation
Cysteine
Humans
Iodine Radioisotopes
Iodohippuric Acid
Kidney
Metabolic Clearance Rate
Organotechnetium Compounds
Rabbits
Radionuclide Imaging
Radiopharmaceuticals
Technetium Tc 99m Mertiatide