Experimental studies of the physiologic properties of technetium-99m agents: Myocardial transport of perfusion imaging agents

Journal Article · Tue Oct 16 00:00:00 EDT 1990 · American Journal of Cardiology; (USA)

DOI:https://doi.org/10.1016/0002-9149(90)90606-2· OSTI ID:6274473

Meerdink, D J; Leppo, J A ^[1]

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1. Univ. of Massachusetts Medical Center, Worcester (USA)

The physiologic properties of new technetium-99m-labeled myocardial imaging agents (Tc-99m sestamibi, an isonitrile; and Tc-99m teboroxime, a boronic acid adduct of technetium dioxime) are discussed and compared to thallium-201 (Tl-201). Studies with isolated hearts, subcellular fractions and cell cultures indicate that Tc-99m sestamibi, Tc-99m teboroxime and Tl-201 do not share common transport or sequestration mechanisms. Although peak Tc-99m sestamibi myocardial extraction over time is about half that of Tl-201 at equivalent coronary blood flows, the amount of Tc-99m sestamibi that remains in the heart is similar to that of Tl-201 because of its higher retention efficiency. The high retention efficiency for Tc-99m sestamibi also results in minimal redistribution. In contrast, Tc-99m teboroxime myocardial extraction is higher than that of Tl-201, but its retention is less efficient, resulting in relatively rapid washout characteristics which may quickly result in tracer redistribution. During reperfusion after a no-flow period, Tc-99m sestamibi extraction and retention increase, but for Tc-99m teboroxime and Tl-201 these values tend to decrease. All tracers show adequate transport characteristics for perfusion imaging, and differences in transport and retention should lead to the development of new clinical protocols.27 references.

• OSTI ID: 6274473
• Journal Information: American Journal of Cardiology; (USA), Journal Name: American Journal of Cardiology; (USA) Vol. 66:13; ISSN 0002-9149; ISSN AJCDA
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BLOOD FLOW
BODY
CARDIOVASCULAR DISEASES
CARDIOVASCULAR SYSTEM
COMPARATIVE EVALUATIONS
DAYS LIVING RADIOISOTOPES
DIAGNOSIS
DISEASES
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
HEART
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
IMAGE PROCESSING
INTERMEDIATE MASS NUCLEI
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
MUSCLES
MYOCARDIUM
NUCLEI
ODD-EVEN NUCLEI
ORGANS
PROCESSING
RADIOISOTOPES
RADIOPHARMACEUTICALS
SECONDS LIVING RADIOISOTOPES
TECHNETIUM 99
TECHNETIUM ISOTOPES
THALLIUM 201
THALLIUM ISOTOPES
YEARS LIVING RADIOISOTOPES