ROENTGEN RAY INTOXICATION : I. UNIT DOSE OVER THORAX NEGATIVE-OVER ABDOMEN LETHAL. EPITHELIUM OF SMALL INTESTINE...

Area of Science:

• Radiology
• Veterinary Medicine
• Radiation Biology

Background:

• Roentgen radiation (X-ray) effects vary significantly based on the irradiated body region.
• Previous studies have not fully elucidated the differential toxicity of X-ray radiation to canine thorax versus abdomen.

Purpose of the Study:

• To investigate the differential toxicity of Roentgen radiation to the canine thorax and abdomen.
• To characterize the clinical and anatomical effects of abdominal X-ray radiation in dogs.

Main Methods:

• Dogs were subjected to controlled doses of Roentgen radiation, either to the thorax (abdomen shielded) or abdomen (thorax shielded).
• Clinical signs, intoxication progression, and anatomical lesions were meticulously documented.

Main Results:

• Thoracic radiation (up to 512 mAm) showed no clinical intoxication, with only transient leucopenia and slight urinary nitrogen increase.
• Abdominal radiation (350 mAm) induced fatal gastrointestinal intoxication with a 24-36 hour latent period, characterized by vomiting and bloody diarrhea.
• Significant anatomical findings included necrosis of the small intestinal epithelium, suggesting this as the primary cause of intoxication.

Conclusions:

• The small intestinal epithelium is highly sensitive to Roentgen radiation, explaining the severe intoxication following abdominal exposure.
• Abdominal radiation poses a significant lethal risk in dogs due to intestinal damage, a factor crucial for clinical consideration.
• Differential sensitivity of body regions to X-rays necessitates careful radiation planning in veterinary medicine.