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J Appl Physiol 56: 966-974, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 56, Issue 4 966-974, Copyright © 1984 by American Physiological Society

ARTICLES

Effect of pulmonary blood flow on leukocyte uptake and release by dog lung

H. V. Thommasen, B. A. Martin, B. R. Wiggs, M. Quiroga, E. M. Baile and J. C. Hogg

The effect of pulmonary blood flow on leukocyte uptake and release by the lung was examined in 10 anesthetized spontaneously breathing dogs. Pulmonary arterial and pulmonary venous blood was sampled with catheters placed into the right ventricle and aorta, respectively. Pulmonary blood flow was lowered by inflating a balloon catheter located in the inferior vena cava. In five experiments simultaneous blood samples were drawn from the right ventricle and aorta at 10-s intervals during a control period, a 2- to 3-min period of low flow, and a recovery period. In five additional experiments, less frequent samples were taken over periods of 15-60 min. Total leukocyte concentrations and differential counts were determined for each blood sample. The study shows that large numbers of leukocytes become sequestered within the lung when pulmonary blood flow is low and that an equivalent number of cells are released from the lung after deflation of the balloon catheter. Both the polymorphonuclear leukocytes and the lymphocytes were taken up by the lung when pulmonary blood flow was reduced. We conclude that pulmonary blood flow has a marked effect on the uptake and release of leukocytes by the dog lung.


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