Journal of Applied Physiology
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J Appl Physiol 49: 643-648, 1980;
8750-7587/80 $5.00
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Journal of Applied Physiology, Vol 49, Issue 4 643-648, Copyright © 1980 by American Physiological Society

ARTICLES

Effect of pulmonary venous pressure on steady-stage collateral resistance

S. D. Fuller, N. E. Robinson and J. B. Scott

Steady-state collateral resistance (Rcoll), residual volume (RV), and lung pressure-volume (PV) relations were determined in an isolated perfused dog lung as pulmonary venous pressure (Ppv) was increased. Increased Ppv had no effect on the lung PV curve except for a significant increase in RV when Ppv equaled or exceeded 20 Torr. When compared to the value at Ppv = 5 Torr, significant decreases in Rcoll occurred when Ppv was raised to 15 Torr or above at transpulmonary pressure, PL = 0 cmH2O, to 20 Torr or above when PL = 2 cmH2O, and to 25 Torr or above when PL = 4 cmH2O. In most dogs the decrease in Rcoll with increased Ppv could be explained by increased lung volume.




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