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[Changes in pulmonary epithelial permeability due to thoracic irradiation]
Nihon Kyobu Shikkan Gakkai Zasshi
|May 1, 1992
Summary
Radiation therapy can increase lung epithelial permeability, even in non-irradiated areas, detected by technetium-99m DTPA scans. This method may identify radiation pneumonitis before symptoms appear.
Area of Science:
- Pulmonary Medicine
- Nuclear Medicine
- Radiotherapy
Context:
- Radiation therapy for chest malignancies can cause lung damage.
- Pulmonary epithelial permeability is a key indicator of lung injury.
Purpose:
- To assess changes in pulmonary epithelial permeability following radiation therapy.
- To evaluate the utility of 99mTc-DTPA aerosol clearance for detecting radiation-induced lung injury.
Summary:
- Ten patients undergoing radiation therapy for chest cancers inhaled 99mTc-DTPA aerosol.
- Pulmonary epithelial permeability, measured by aerosol clearance half-time (t1/2), increased in patients developing radiation pneumonitis.
- Increased permeability was noted in both affected and unaffected lung regions, and steroid therapy reversed these changes.
Impact:
- Detects subclinical pulmonary epithelial permeability changes before clinical radiation pneumonitis manifests.
- Highlights that radiation injury extends beyond the direct radiation field.
- Suggests 99mTc-DTPA aerosol clearance is a sensitive tool for monitoring radiation pneumonitis risk.