Retention of soluble 99mTc-DTPA in the human lung: 24-h postdeposition.


Journal Article

Clearance of low-molecular-weight solutes, e.g., radiolabeled chelate diethylenetriaminepentaacetate (DTPA), across epithelial surfaces of distal airways and the lung parenchyma is a broadly used technique to assess epithelial integrity. It has been generally assumed that clearance of solute follows a simple first-order process and that DTPA clearance through the respiratory epithelium and into blood and lymphatic channels is complete within a few hours. Using gamma-camera imaging and a radiolabeled aerosol of 99mTc-labeled DTPA, we observed in eight healthy subjects lung retention of radioisotope approximately 24 h postdeposition of the 99mTc-DTPA. Residual lung retention at the 24-h end point averaged 6.0 +/- 1.8 (SD)% of the amount of radioisotope initially deposited in the lung. This suggests that for normal healthy subjects a small amount of the 99mTc radioisotope, either in a dissociated or chelated form, is nonpermeable or slowly cleared from respiratory tisssues.

Full Text

Cited Authors

  • Foster, WM; Stetkiewicz, PT; Freed, AN

Published Date

  • April 1997

Published In

Volume / Issue

  • 82 / 4

Start / End Page

  • 1378 - 1382

PubMed ID

  • 9104878

Pubmed Central ID

  • 9104878

Electronic International Standard Serial Number (EISSN)

  • 1522-1601

International Standard Serial Number (ISSN)

  • 8750-7587

Digital Object Identifier (DOI)

  • 10.1152/jappl.1997.82.4.1378


  • eng