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J Appl Physiol 51: 1568-1573, 1981;
8750-7587/81 $5.00
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Journal of Applied Physiology, Vol 51, Issue 6 1568-1573, Copyright © 1981 by American Physiological Society

ARTICLES

Single-breath nitrogen test in excised human lungs

N. Berend, C. Skoog and W. M. Thurlbeck

Pressure-volume curves and simulated single-breath nitrogen tests were performed on 32 excised left human lungs and the slope of phase III, and phase IV plus minimal volume, expressed as percent of the lung volume at a transpulmonary pressure of 30 cmH2O (closing capacity), was calculated. The lungs were graded as to the degree of emphysema and degree of peripheral airways disease. Peripheral airway dimensions were also measured. The closing capacity expressed as percent predicted in vivo was significantly correlated with the total pathological scores (P less than 0.01) and inflammation scores (P less than 0.01) as well as the transpulmonary pressures at the onset of phase IV (P less than 0.01). Correlations with the emphysema grade were not significant. The slopes of phase III were highly variable even among normal lungs and could not be shown to correlate with airways disease or emphysema.


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