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Regional pulmonary function in sarcoidosis

E Weitzenblum, B Moyses, C Hirth

    Scandinavian Journal of Respiratory Diseases
    |January 1, 1977
    PubMed
    Summary
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    Regional lung function in thoracic sarcoidosis shows ventilation and perfusion changes across disease stages. Diffusing capacity reduction may stem from lost pulmonary capillaries, not just ventilation-perfusion imbalances.

    Area of Science:

    • Pulmonary Medicine
    • Radiology
    • Physiology

    Background:

    • Thoracic sarcoidosis is a multisystem inflammatory disease affecting the lungs.
    • Understanding regional lung function is crucial for assessing sarcoidosis progression and impact.
    • Previous studies often focused on overall lung function, with less emphasis on regional disparities.

    Purpose of the Study:

    • To investigate regional lung function using Xenon 133 in patients with thoracic sarcoidosis.
    • To correlate regional functional abnormalities with disease stages and overall lung function parameters.
    • To explore the underlying causes of reduced diffusing capacity in sarcoidosis.

    Main Methods:

    • Studied 26 subjects with histologically confirmed thoracic sarcoidosis.

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  • Utilized Xenon 133 for regional ventilation (Vr) and perfusion (Qr) assessments.
  • Performed overall lung function tests, including steady-state (TCO SS) and single-breath (TCO SB) diffusing capacity.

    • Main Results:

    • Regional ventilation was increased in stages I and II, normal in stage III. Regional perfusion was normal in stages I and II, decreased in stage III.
    • Deficiency abnormalities were rare in early stages but frequent in stage III (pulmonary fibrosis).
    • Lowered TCO SB/VA correlated significantly with regional deficiency abnormalities, particularly perfusion deficits.

    Conclusions:

    • Regional lung function in sarcoidosis varies with disease stage, with distinct patterns of ventilation and perfusion.
    • Reduced diffusing capacity in sarcoidosis may be attributed to the loss of pulmonary capillaries.
    • These findings suggest that evaluating regional perfusion is important for understanding sarcoidosis-related lung damage.