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Metal ion release from paramagnetic chelates: what is tolerable?

S M Rocklage1, D Worah, S H Kim

  • 1Salutar, Inc., Sunnyvale, California 94086.

Magnetic Resonance in Medicine
|December 1, 1991
PubMed
Summary

Paramagnetic metal chelate complexes used as MRI contrast agents show low toxicity at clinical doses. Studies indicate minimal gadolinium release in vivo, with remaining amounts excreted slowly, and manganese cleared efficiently by the liver.

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Area of Science:

  • Medical Imaging
  • Radiochemistry
  • Toxicology

Background:

  • Paramagnetic metal chelates are widely used as contrast enhancement agents in Magnetic Resonance Imaging (MRI).
  • Assessing the in vivo toxicity and metal ion release of these agents is crucial for patient safety.

Purpose of the Study:

  • To evaluate the toxicity and in vivo metal ion release of paramagnetic metal chelate complexes used as MRI contrast agents.
  • To understand the excretion pathways and potential accumulation of gadolinium and manganese.

Main Methods:

  • Solution thermodynamic, solubility, and selectivity studies were performed on gadolinium chelate complexes.
  • Analysis focused on the in vivo release and clearance mechanisms of metal ions from contrast agents.

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Main Results:

  • Gadolinium chelate complexes demonstrate minimal in vivo metal release, with slow but eventual excretion.
  • Manganese-based chelate complexes show efficient clearance through the liver, though release mechanisms require further study.
  • Current clinical doses appear relatively non-toxic.

Conclusions:

  • Paramagnetic metal chelates, at administered clinical doses, are generally safe with minimal metal ion release.
  • Further research is needed to fully elucidate long-term effects of potential metal ion deposition, especially with repeated administration.