title: 201Tl, 99mTc-MIBI, 99mTc-tetrofosmin and 99mTc-furifosmin: relative retention and clearance kinetics in retrogradely perfused guinea pig hearts.
abstract: Myocellular kinetics of 201Tl, 99mTc-MIBI, 99mTc-tetrofosmin and 99mTc-furifosmin were investigated using retrogradely-perfused guinea-pig hearts. Relative retention decreased in the order 99mTc-MIBI ==> 99mTc-tetrofosmin ==> 99mTc-furifosmin. 201Tl and 99mTc-MIBI exhibited bi- (t1,t2), 99mTc-tetrofosmin and 99mTc-furifosmin triexponential (t1,t2,t3) time-activity-curves. Latest-phase elimination-half-life increased from 201Tl (t2) ==> 99mTc-MIBI (t2) ==> 99mTc-tetrofosmin (t3) ==> 99mTc-furifosmin (t3), showing a significant increase in deteriorating myocardium for all tracers but 99mTc-furifosmin. Delayed elimination in deteriorating myocardium explains at least partly the redistribution phenomenon of 201Tl, and suggests a similar phenomenon for 99mTc-MIBI and 99mTc-tetrofosmin.
authors.affiliation: Department of Nuclear Medicine, University Hospital, University of Cologne, Joseph-Stelzmann-Str. 9, 50924, Cologne, Germany.
authors.forename: Wolfgang M
authors.initials: WM
authors.lastname: Schaefer
authors.forename: Detlef
authors.initials: D
authors.lastname: Moka
authors.forename: Holger A
authors.initials: HA
authors.lastname: Brockmann
authors.forename: Klaus
authors.initials: K
authors.lastname: Schomaecker
authors.forename: Harald
authors.initials: H
authors.lastname: Schicha
mesh_terms: D000818:Animals; D005663:Furans / Q000493:pharmacokinetics*; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D009943:Organophosphorus Compounds / Q000493:pharmacokinetics*; D015609:Organotechnetium Compounds / Q000493:pharmacokinetics*; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D017256:Technetium Tc 99m Sestamibi / Q000493:pharmacokinetics*; D013997:Time Factors
chemical_list: D005663:Furans; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; C078496:technetium Tc 99m Q12; C078700:technetium tc-99m tetrofosmin; D017256:Technetium Tc 99m Sestamibi