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Related Experiment Videos

Extracellular gadolinium contrast agents: differences in stability.

S K Morcos1

  • 1Department of Diagnostic Imaging, Sheffield Teaching Hospitals NHS Foundation Trust, Northern General Hospital, Sheffield S5 7AU, UK. sameh.morcos@sth.nhs.uk

European Journal of Radiology
|March 18, 2008
PubMed
Summary
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Gadolinium contrast agents (Gd-CA) stability impacts nephrogenic systemic fibrosis risk. Stable macrocyclic Gd-CA, unlike less stable linear agents, show no associated NSF cases, highlighting safety differences.

Area of Science:

  • Radiology
  • Medical Imaging
  • Pharmacology

Background:

  • Extracellular gadolinium contrast agents (Gd-CA) are crucial for MRI.
  • Gd-CA exist as linear or macrocyclic chelates, and ionic or non-ionic preparations.
  • Agent structure and ionicity influence Gd-CA stability and safety.

Purpose of the Study:

  • To evaluate the relationship between Gd-CA structure, stability, and nephrogenic systemic fibrosis (NSF).
  • To compare the stability of different Gd-CA formulations.
  • To assess the clinical implications of Gd-CA stability for patient safety.

Main Methods:

  • Analysis of stability constants and kinetic measurements for various Gd-CA.
  • In vivo assessment of Gd-CA stability.
  • Review of clinical data regarding NSF occurrence with different Gd-CA types.

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Main Results:

  • Ionic-macrocyclic chelates (e.g., Gd-DOTA) are most stable; non-ionic linear chelates (e.g., gadodiamide) are least stable.
  • In vivo data confirmed lower stability of non-ionic linear chelates.
  • No significant stability difference was found among macrocyclic agents (ionic or non-ionic).

Conclusions:

  • Gd-CA stability is a key factor in NSF pathogenesis.
  • Low-stability Gd-CA may release free Gd ions, leading to tissue deposition and fibrosis.
  • Exclusive use of stable macrocyclic Gd-CA is associated with no observed NSF cases.