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Related Experiment Videos

Myocardial paramagnetic contrast agents for MR imaging.

J J Brown1, C B Higgins

  • 1Department of Radiology, University of California, San Francisco 94143.

AJR. American Journal of Roentgenology
|November 1, 1988
PubMed
Summary

Researchers are exploring new paramagnetic contrast agents for myocardial MR imaging to better detect acute myocardial infarcts. Current agents like Gd-DTPA have limitations, prompting the development of novel agents for improved perfusion assessment.

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Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Radiology

Background:

  • Paramagnetic contrast agents are crucial for myocardial Magnetic Resonance (MR) imaging.
  • Gadolinium diethylenetriaminepentaacetic acid (Gd-DTPA) enhances acute myocardial infarct conspicuity in animal and human studies.
  • Gd-DTPA's rapid renal excretion and extracellular distribution limit its utility as a perfusion marker.

Purpose of the Study:

  • To review the current status and future directions of paramagnetic contrast agents in myocardial MR imaging.
  • To identify limitations of existing agents and explore the potential of novel agents for improved diagnostic capabilities.

Main Methods:

  • Review of existing literature on paramagnetic contrast agents for myocardial MR imaging.
  • Discussion of the properties and limitations of Gd-DTPA.

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  • Exploration of ongoing research into nondiffusable agents and macromolecular-bound chelates.

    • Main Results:

    • Gd-DTPA improves visualization of acute myocardial infarcts.
    • Gd-DTPA's pharmacokinetic profile restricts its use in assessing myocardial perfusion.
    • Newer agents with prolonged myocardial retention and nondiffusable properties are under active investigation.

    Conclusions:

    • Further research is needed to develop contrast agents that accurately assess myocardial perfusion and detect ischemic regions before edema onset.
    • Novel agents, including macromolecular-bound chelates, show promise for improved detection of jeopardized myocardium.
    • Clinical trials for new agents require thorough toxicity and metabolism assessments.