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Related Experiment Videos

Renal imaging with 99Tc(m)-dextran

A Bhatnagar1, A K Singh, A Babbar

  • 1Department of Nuclear Medicine, Institute of Nuclear Medicine and Allied Sciences, Lucknow Marg, Delhi, India.

Nuclear Medicine Communications
|June 1, 1997
PubMed
Summary
This summary is machine-generated.

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Technetium-99m-dextran demonstrates significant uptake and retention in the renal parenchyma, making it a promising agent for renal cortex imaging. Its stability and comparable target-to-nontarget ratios suggest viability for diagnostic applications.

Area of Science:

  • Nuclear Medicine
  • Radiopharmaceutical Development
  • Renal Imaging

Background:

  • Intravascular use of Technetium-99m-dextran revealed unexpected renal parenchyma uptake.
  • Renal Single-Photon Emission Computed Tomography (SPET) confirmed parenchymal retention.
  • The need for novel renal cortex imaging agents prompted further investigation.

Purpose of the Study:

  • To evaluate Technetium-99m-dextran (99Tc(m)-dextran) as a renal cortex imaging agent.
  • To assess the stability of parenchymal retention of 99Tc(m)-dextran.
  • To compare the renal parameters of 99Tc(m)-dextran with established agents like 99Tc(m)-DTPA and 99Tc(m)-DMSA(III).

Main Methods:

  • Intravenous administration of 99Tc(m)-dextran to 71 normal kidneys.
  • Comparison with 99Tc(m)-DTPA (n=10) and 99Tc(m)-DMSA(III) (n=23) renograms.

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  • Assessment of parenchymal retention stability via 24-hour outflow and frusemide intervention.

    • Main Results:

    • 99Tc(m)-dextran exhibited stable parenchymal retention with insignificant outflow at 24 hours.
    • Early glomerular extraction phase of 99Tc(m)-dextran renograms was similar to 99Tc(m)-DTPA.
    • Mean cortex-to-background ratios at 2 hours were comparable to 99Tc(m)-DMSA(III) (14.9 vs 16.0).
    • Similar target-to-nontarget ratios were observed due to faster background clearance of 99Tc(m)-dextran.

    Conclusions:

    • 99Tc(m)-dextran demonstrates stable retention in the renal parenchyma, likely via trapping at the glomerular endothelial-epithelial interphase.
    • The agent shows potential as a viable option for renal parenchyma imaging.
    • Further studies are warranted to fully establish its clinical utility.