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J Appl Physiol 59: 1783-1789, 1985;
8750-7587/85 $5.00
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Journal of Applied Physiology, Vol 59, Issue 6 1783-1789, Copyright © 1985 by American Physiological Society

ARTICLES

Changes in lung volume and deflation stability in hyaline membrane disease

J. C. Jackson, T. A. Standaert, W. E. Truog, J. H. Murphy, S. Palmer, E. Y. Chi, D. E. Woodrum, J. F. Watchko and W. A. Hodson

Total lung capacity (TLC), inspiratory capacity, functional residual capacity, and deflation stability of prematurely delivered Macaca nemestrina primates were measured serially during development of, and recovery from, hyaline membrane disease (HMD) to relate changes in lung volumes to changes in deflation stability. Gestational age-matched primates that did not develop HMD served as controls. TLC, measured by N2 washout, fell at 2-12 h of age (P less than 0.0001) in animals with HMD and remained lower than controls for at least 48 h (P less than 0.005). However, deflation stability, defined as the fraction of TLC remaining upon deflation to 10 cm H2O, improved from 2 to 12 h of age (P less than 0.001). Postmortem studies confirm the measurements of TLC and deflation stability and provide evidence that interstitial thickening and obstruction of air spaces with debris may be partially responsible for the observed changes in TLC in primates that develop HMD. It has been assumed that TLC is reduced in HMD because of atelectasis from elevated alveolar surface tension, but the sequential measurements in these animals suggest that other mechanisms also contribute.


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