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Related Experiment Videos

A simple method for preparing radioactive capsules in colon transit study.

S J Wang1, S C Tsai, W Y Lin

  • 1Department of Nuclear Medicine, Taichung Veterans General Hospital, Taiwan. sjwang@vghtc.vghtc.gov.tw

European Journal of Nuclear Medicine
|August 22, 2000
PubMed
Summary
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A simpler colon transit study method using enteric capsules shows similar results to coated capsules. This offers a viable alternative for routine clinical use, improving accessibility for colon transit time measurement.

Area of Science:

  • Gastroenterology
  • Nuclear Medicine
  • Radiopharmacy

Background:

  • Current colon transit studies use methacrylate-coated capsules, which are complex to prepare and lack FDA approval.
  • A simpler, approved method is needed for routine clinical colon transit time measurement.

Purpose of the Study:

  • To evaluate the suitability of a commercial enteric capsule as an alternative to methacrylate-coated capsules for colon transit time studies.
  • To compare the in vitro stability and in vivo scintigraphy of technetium-99m (99mTc)-labeled activated charcoal in both capsule types.

Main Methods:

  • 99mTc-DTPA labeled activated charcoal was loaded into both coated and enteric capsules.
  • In vitro stability was assessed across variable pH conditions.
  • In vivo colon transit scintigraphy was performed in five healthy volunteers.

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Main Results:

  • Both capsule types exhibited similar in vitro stability.
  • Colon transit scintigraphy findings were nearly identical between the two capsule types.
  • Capsules primarily dissolved in the ascending colon, with minimal dissolution in the terminal ileum.

Conclusions:

  • The commercial enteric capsule is a suitable and simpler alternative to coated capsules for colon transit time measurement.
  • This finding supports the potential clinical adoption of enteric capsules for routine colon transit studies.