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Vol. 83, Issue 6, 1941-1946, December 1997
1 Klinik und Poliklinik für Anästhesiologie und operative Intensivmedizin, der Westfälischen Wilhelms-Universität, Münster, Germany; and 2 Department of Anesthesiology, The University of Texas Medical Branch, Galveston, Texas 77555-1091
Received 20 August 1996; accepted in final form 25 July 1997.
Hinder, Frank, Michael Booke, Lillian D. Traber, and Daniel
L. Traber. Nitric oxide and endothelial permeability.
J. Appl. Physiol. 83(6):
1941-1946, 1997.
Nitric oxide synthase inhibition reverses
systemic vasodilation during sepsis but may increase endothelial
permeability. To assess adverse effects on the pulmonary vasculature,
12 sheep were chronically instrumented with lung lymph fistulas and
hydraulic pulmonary venous occluders. Escherichia coli endotoxin (lipopolysaccharide; 10 ng · kg
1 · min
1)
was continuously infused for 32 h. After 24 h, six animals received 25 mg/kg of N
-nitro-L-arginine
methyl ester (L-NAME), and six
received saline. All sheep developed a hyperdynamic circulatory
response and elevated lymph flows by 24 h of lipopolysaccharide
infusion. L-NAME reversed systemic vasodilation, increased pre- and postcapillary pulmonary vascular resistance index, pulmonary arterial pressure, and,
transiently, effective pulmonary capillary pressure. Lung lymph flows
were not different between groups at 24 h or thereafter. Calculated as
changes from baseline, however, lung lymph flow was higher in the
L-NAME group than in the control
animals, with a trend toward lower lymph-to-plasma protein
concentration ratio at 25 h. Permeability analysis at 32 h by the
venous occlusion technique showed normal reflection coefficients and
elevated filtration coefficients without differences between groups.
Reversal by L-NAME of the
systemic vasodilation during endotoxemia was associated with high
pulmonary vascular resistance without evidence of impaired pulmonary
endothelial barrier function.
nitric oxide synthase inhibition; lung; hyperdynamic sepsis; lung edema; vasodilation; pulmonary endothelial permeability
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