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Pulmonary histiocytosis X: pulmonary function and exercise pathophysiology

R S Crausman1, C A Jennings, R M Tuder

  • 1Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado 80206, USA.

American Journal of Respiratory and Critical Care Medicine
|January 1, 1996
PubMed
Summary

Pulmonary histiocytosis X (PHX), a smoking-related lung disease, commonly causes exercise limitation. This study found that impaired pulmonary vascular function, not breathing issues, is the primary cause of exercise limitation in PHX patients.

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Area of Science:

  • Pulmonary Medicine
  • Cardiopulmonary Physiology
  • Respiratory Diseases

Background:

  • Pulmonary histiocytosis X (PHX) is a diffuse, smoking-related lung disease.
  • PHX is pathologically defined by bronchocentric inflammation, cysts, and vascular abnormalities.
  • Exercise limitation is a known physiological consequence of PHX, but its underlying mechanism is unclear.

Purpose of the Study:

  • To define the primary mechanism of exercise impairment in patients with Pulmonary Histiocytosis X.
  • To investigate the relationship between pulmonary physiology and exercise performance in PHX.

Main Methods:

  • Evaluated 23 patients with PHX using spirometry, lung volumes, lung mechanics, and exercise physiology.
  • Subgrouped patients based on elastic recoil: elevated vs. normal.

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  • Assessed ventilatory function, gas exchange, and pulmonary vascular indices (DLCO, VD/VT).

    • Main Results:

    • Exercise performance was severely limited in all PHX patients, regardless of subgroup.
    • Pulmonary vascular function indices (DLCO, VD/VT) were abnormal in most subjects.
    • Significant correlations were found between exercise performance and pulmonary vascular dysfunction (DLCO, VD/VT).

    Conclusions:

    • PHX patients exhibit either normal or predominantly restrictive pulmonary physiology.
    • Exercise impairment in PHX is common and primarily linked to pulmonary vascular dysfunction.