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J Appl Physiol 60: 623-629, 1986;
8750-7587/86 $5.00
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Journal of Applied Physiology, Vol 60, Issue 2 623-629, Copyright © 1986 by American Physiological Society

ARTICLES

Lung lymph flow during volume infusions

J. C. Gabel, K. D. Fallon, G. A. Laine and R. E. Drake

We investigated the effect of intravenous isotonic crystalloid solution infusion on lung lymph flow. Tracheobronchial lung lymph vessels were cannulated in 13 anesthetized dogs. The lymph flow rate was measured 1) with the lymph flowing against atmospheric pressure (QL), and 2) with the pressure at the outflow end of the lymph cannula equal to systemic venous pressure (QLV). QL and QLV were measured alternately in each lymph vessel. In one group of nine dogs, the base-line QL and QLV were 18 +/- 9 and 13 +/- 6 (SD) microliter/min, respectively (P less than 0.05). QL increased by 4.8 +/- 1.4-fold, and QLV increased by 3.5 +/- 2.1-fold during a 4-h infusion of 25 ml X kg-1 X h-1 of Ringer solution. QLV was significantly less than QL at all times. The increases in lymph flow were caused primarily by a reduction in the effective resistance of the lymph vessels with little rise in the pressure driving lymph from the lungs. Because QLV flowed against systemic venous pressure, the increase in QLV was blunted by a 3.1 +/- 2.3 cmH2O rise in venous pressure during the infusions. In the remaining four dogs, we infused Ringer solution rapidly in order to raise venous pressure to greater than 15 cmH2O. This caused QL to increase by 25 +/- 7-fold; however, QLV decreased to zero. We conclude that elevations in venous pressure which occur during volume infusions oppose lung lymph flow and lead to accumulation of excess fluid in the lungs.


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