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  • Title: Gastric xenon trapping mimicking COPD: recognition using an effervescent agent.
    Author: Wahl RL.
    Journal: Eur J Nucl Med; 1986; 12(3):155-7. PubMed ID: 3758105.
    Abstract:
    Trapping of xenon 133 in the stomach due to gas swallowing can mimic xenon 133 retention in the left lower lobe due to obstructive lung disease on pulmonary ventilation/perfusion studies. In such cases, ingestion of sodium citrate-bicarbonate-simethicone crystals, which form CO2 gas on contact with water, can distend the xenon-containing stomach and allow clear delineation of its gastric location. This approach is useful in selected cases and may help avoid false-positive diagnoses of obstructive airways disease.
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