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Sequential dose injections. A new technique for technetium-99m colloid gastrointestinal bleeding studies
C B Delaplain1, M C Ling, F Yeh
1Department of Nuclear Medicine, Kuakini Medical Center, Honolulu, Hawaii.
Clinical Nuclear Medicine
|November 1, 1988
Summary
Sequential dose injections of Technetium-99m (Tc-99m) colloid improve bleeding detection. This technique increases circulation time, aiding in identifying active gastrointestinal bleeding sites.
Area of Science:
- Nuclear Medicine
- Radiopharmacology
Background:
- Tc-99m colloid bleeding studies require active bleeding during blood pool circulation.
- Optimal detection necessitates sufficient colloid residence time for imaging.
Observation:
- A novel sequential dose injection (SDI) technique is introduced.
- Five injections of 2 mCi Tc-99m colloid are administered at 5-minute intervals, with imaging after each.
- This method extends colloid plasma residence time from 10-15 to 35-40 minutes.
Findings:
- The SDI technique significantly enhances the duration of radiotracer circulation.
- A case report demonstrates successful identification of a bleeding site only after the fifth serial injection.
- Fractionated dosing with Tc-99m microaggregated albumin colloid proved effective.
Implications:
- SDI offers improved sensitivity for Tc-99m colloid bleeding scintigraphy.
- This technique can enhance the diagnostic yield in identifying active gastrointestinal hemorrhage.
- Extended imaging windows may facilitate detection of intermittent or slow bleeding.