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Gastric xenon trapping mimicking COPD: recognition using an effervescent agent
European Journal of Nuclear Medicine
|January 1, 1986
Summary
Gas swallowing can cause stomach xenon 133 uptake, mimicking lung disease on ventilation/perfusion scans. Ingesting effervescent crystals can clarify gastric location, preventing false-positive obstructive airways disease diagnoses.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Pulmonary Medicine
Background:
- Pulmonary ventilation/perfusion (V/Q) studies are crucial for diagnosing lung diseases.
- Xenon 133 (Xe-133) is a common radiotracer used in V/Q imaging.
- Gastric trapping of Xe-133 can be mistaken for lung pathology.
Observation:
- Swallowed air containing Xe-133 can accumulate in the stomach.
- This gastric retention can mimic Xe-133 distribution in the left lower lobe of the lungs.
- Misinterpretation can lead to a false-positive diagnosis of obstructive lung disease.
Findings:
- Ingestion of sodium citrate-bicarbonate-simethicone crystals is proposed as a diagnostic aid.
- These crystals produce carbon dioxide (CO2) gas upon contact with water.
- The generated CO2 gas distends the stomach, clearly identifying the Xe-133's gastric location.
Implications:
- This technique can help differentiate true pulmonary Xe-133 retention from gastric trapping.
- It may prevent misdiagnosis of obstructive airways disease in V/Q studies.
- This method offers a simple, effective solution for a specific imaging artifact.