Abstract
Altered Vo2-Do2 relationships are most often noted to occur in the setting of sepsis or endotoxin (LPS)-induced systemic organ microvascular injury and are generally thought to be causally linked to that injury. However, we have recently shown that ileal microvascular injury is not associated with altered ileal Vo2-Do2, relationships. Thus, we hypothesized that the severity of LPS-induced systemic organ microvascular injury would not correlate with the development of systemic organ Vo2-Do2 alterations. To test this hypothesis, we used the in situ autoperfused feline ileal preparation to simultaneously examine microvascular permeability, reflected as the ileal lymph to plasma protein concentration ratio (CL/CP), and ileal Vo2-Do2 relationships 2 hours after intravenous LPS (0.75-2.0 mg/kg; n = 9) and in matching controls (n = 5). As expected, all LPS-treated animals were found to have extensive ileal histological damage and marked increases in the CL/CP compared with controls (0.308 +/- 0.019 v 0.097 +/- 0.009; P < .001). In addition, although the critical Do2 (Do2c) was elevated in the LPS-treated animals relative to controls (34.2 +/- 5.0 v 16.7 +/- 1.4 mL/min/kg; P < .03), there was no correlation between the Do2c and the CL/...Continue Reading
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