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MR contrast agents: physical and pharmacologic basics.

Shao-Pow Lin1, Jeffrey J Brown

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S. Kingshighway Boulevard, St. Louis, MO 63110, USA.

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Gadolinium-based contrast agents are widely used in MRI but are not biologically inert. Radiologists must understand their pharmacology and potential risks, especially in specific patient populations.

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Area of Science:

  • Radiology
  • Pharmacology
  • Medical Imaging

Background:

  • Intravenous gadolinium (Gd)-based contrast agents are extensively used in Magnetic Resonance (MR) imaging, with nearly half of all MR studies now contrast-enhanced.
  • Despite their widespread use and perceived safety, the notion that these agents are "biologically inert" is inaccurate.
  • The clinical pharmacology of Gd-based agents, including their potential adverse effects, is not always comprehensively covered in medical education.

Purpose of the Study:

  • To review the mechanism of action of MR contrast agents.
  • To discuss the clinical pharmacology of Gd-based agents, focusing on cardiovascular and renal effects.
  • To address potential laboratory errors and special considerations for women and children, including nephrogenic systemic fibrosis (NSF).

Main Methods:

  • Literature review of MR contrast agent pharmacology.
  • Analysis of clinical data regarding adverse effects and special populations.
  • Discussion of mechanisms of action and biological effects.

Main Results:

  • Gd-based contrast agents, while effective and generally well-tolerated, possess biological activity and are not inert.
  • Understanding their pharmacology is crucial for safe clinical practice.
  • Specific patient groups and conditions may require special consideration due to potential risks.

Conclusions:

  • Radiologists must be aware of the pharmacology and potential adverse effects of Gd-based contrast agents.
  • Comprehensive education on contrast agent pharmacology is needed.
  • Careful consideration of patient factors is essential for the safe use of these agents.