Fine structural morphometry of diffuse lung diseases with abnormal blood-air gas transfer

Samples of lung biopsy tissue from nine patients with normal lungs, seven with pulmonary sarcoidosis, nine with diffuse interstitial pulmonary fibrosis, seven with histiocytosis X, and one with asbestosis were analyzed by morphometric techniques applied to electron micrographs, and the results were subjected to rank-sum analysis. Within the limits of the sampling method and the mathematical predictions of others, the general rejection of the constructed hypothesis in this study supports the conclusion that factors other than increase in the arithmetic of harmonic mean thickness of the blood-air barrier are critical to impaired gas transfer in the diseases studied.