Maintenance of superior mesenteric arterial perfusion prevents increased intestinal mucosal permeability in endotoxic pigs.
Lipopolysaccharide increases intestinal mucosal permeability to hydrophilic compounds such as chromium 51-labeled edetate (51Cr-EDTA). We sought to determine whether this phenomenon is partly mediated by lipopolysaccharide-induced mesenteric hypoperfusion. We assessed permeability in an isolated segment of ileum by measuring plasma-to-lumen clearances (C) for two probes, 51Cr-EDTA and urea, and expressing the results as a ratio (CEDTA/CUREA). In control pigs (n = 6) resuscitated with Ringer's lactate (RL), mucosal permeability was unchanged during the 210-minute period of observation. In pigs (n = 7) infused with lipopolysaccharide (50 micrograms/kg) and similarly resuscitated with RL, mesenteric perfusion (Qsma) decreased significantly and permeability increased progressively and significantly. When endotoxic pigs (n = 6) were resuscitated with a regimen (RL plus hetastarch plus dobutamine) that preserved normal Qsma, lipopolysaccharide-induced mucosal hyperpermeability was prevented. Resuscitation of endotoxic pigs (n = 6) with RL plus hetastarch provided intermediate protection against both mesenteric hypoperfusion and increased permeability. These data suggest that diminished Qsma contributes to impaired ileal mucosal barrier function in experimental endotoxicosis.
Fink
M P
MP
Department of Surgery, University of Massachusetts Medical Center, Worcester 01655.
Kaups
K L
KL
Wang
H L
HL
Rothschild
H R
HR
D000704:Analysis of Variance; D000818:Animals; D002860:Chromium Radioisotopes; D004492:Edetic Acid / Q000378:metabolism; D004926:Escherichia coli; D066298:In Vitro Techniques; D007413:Intestinal Mucosa / Q000503:physiopathology*; D008070:Lipopolysaccharides; D008297:Male; D008638:Mesenteric Arteries / Q000503:physiopathology*; D010539:Permeability; D012039:Regional Blood Flow; D012772:Shock, Septic / Q000503:physiopathology*; D013552:Swine; D014508:Urea / Q000097:blood
D002860:Chromium Radioisotopes; D008070:Lipopolysaccharides; D014508:Urea; D004492:Edetic Acid