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J Appl Physiol 38: 411-417, 1975;
8750-7587/75 $5.00
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Journal of Applied Physiology, Vol 38, Issue 3 411-417, Copyright © 1975 by American Physiological Society

ARTICLES

Effect of intrathoracic pressure on pressure-volume characteristics of the lung in man

H. S. Goldberg, W. Mitzner, K. Adams, H. Menkes, S. Lichtenstein and S. Permutt

Quasi-static pressure-volume (P-V) curves in normal seated human subjects were determined with pressure at the airway opening (Pa0) set below (negative pressure), above (positive pressure), or equal to ambient pressure. Dynamic compliance (Cdyn) during controlled continuous negative pressure breathing (CNPB) was also studied. Quasi-static P-V curves at negative pressure were decreased in slope, reflected a decrease in total lung capacity, and intersected the P-V curve obtained at ambient Pa0. At positive pressure the P-V curves showed an increase in slope and an increase in total lung capacity. During CNPB a fall in Cdyn was found. The fall in Cdyn was rapid and persisted for the duration of CNPB. Cdyn promptly returned to control levels when Pa0 was adjusted to ambient pressure.


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