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Ventilation corrected oxygen tension in lethal pulmonary embolism

E H Hale, P S Shankar

    Journal of the National Medical Association
    |January 1, 1978
    PubMed
    Summary

    Pulmonary embolism diagnosis is aided by assessing oxygen levels. Ventilation corrected oxygen tension, alveolar-arterial oxygen difference, and oxygen ratio are sensitive indicators of hypoxemia in patients.

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    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology
    • Diagnostic Testing

    Background:

    • Lethal pulmonary embolism frequently presents with hypoxemia and hypocapnia.
    • Accurate and sensitive diagnostic methods are crucial for timely intervention.

    Purpose of the Study:

    • To evaluate the sensitivity of various oxygenation tests in diagnosing pulmonary embolism.
    • To compare the efficacy of different tests under varying oxygen breathing conditions.

    Main Methods:

    • Assessment of ventilation corrected oxygen tension in patients breathing air.
    • Measurement of alveolar-arterial oxygen tension difference and oxygen ratio during air and oxygen breathing.
    • Evaluation of oxygen saturation as a diagnostic marker.

    Main Results:

    • Ventilation corrected oxygen tension showed high sensitivity, identifying 96% of patients with moderate to extreme hypoxemia.
    • Alveolar-arterial oxygen tension difference and oxygen ratio were equally sensitive during air breathing.
    • During oxygen inhalation, alveolar-arterial oxygen tension difference was the most sensitive test, followed by oxygen ratio, while oxygen saturation was least sensitive.

    Conclusions:

    • Ventilation corrected oxygen tension is a highly sensitive test for detecting hypoxemia in pulmonary embolism patients breathing air.
    • Alveolar-arterial oxygen tension difference is the most sensitive indicator during supplemental oxygen administration.

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