Measurement of Pulmonary Function

This was a book chapter by G.W. Wright that reviewed methods for measuring how the lungs work: blood gases, lung volumes, airflow, airway resistance, diffusion and the breathing response to exercise. It then used four patient case presentations to show how these measurements relate to what pathologists find in lung tissue. The chapter did not study asbestos. In a patient with pulmonary artery obstruction, the breathing needed for a given amount of oxygen during exercise was almost 3 times normal. In a patient with diffuse fibrosis, lung volumes were below normal in a pattern typical of a restrictive defect. In a patient with chronic bronchitis and airway obstruction, the residual volume was high and the vital capacity reduced, with severe low oxygen and high carbon dioxide in the blood, and pulmonary artery hypertension. In a patient with anatomical emphysema, there was no raised carbon dioxide even during exercise. The author stated that changes in the balance between ventilation and blood flow are now recognized as the most common cause of low blood oxygen. The author also noted that methods for measuring diffusion are far from perfect.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

From J-M's medical library

This copy comes from the Johns-Manville medical library. It was among the papers J-M kept in its medical library without an index entry.

We publish pages from a book for research and commentary: it shows what the medical literature in a leading asbestos company's own library said on the subject, and when. Our summary above is our own reading of it. The copyright stays with the publisher.