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Interstitial fluid accumulation does not influence oxygen uptake in the rabbit small intestine
1Department of Physiology, University of Bergen, Norway.
Acta Anaesthesiologica Scandinavica
|February 1, 1995
Summary
Crystalloid resuscitation can increase fluid in tissues. This study found that acute increases in extracellular volume, even with intestinal ischemia, did not impair the gut's oxygen uptake in rabbits.
Area of Science:
- Physiology
- Gastroenterology
- Critical Care Medicine
Background:
- Crystalloid resuscitation is common but increases interstitial fluid.
- Intestinal ischemia and impaired barrier function are linked to multiple organ failure.
- The effect of interstitial edema on gut oxygen extraction is not fully understood.
Purpose of the Study:
- To investigate whether interstitial edema in the intestine impairs tissue oxygen extraction.
- To assess the impact of acute extracellular volume expansion on gut oxygen uptake.
Main Methods:
- Anesthetized rabbits underwent partial portal vein obstruction and saline infusion to induce edema.
- Small intestinal water content was measured.
- Oxygen uptake was calculated using arteriovenous oxygen content and mesenteric blood flow.
- Intestinal oxygenation was monitored via mesenteric venous lactate, base excess, and mucosal pH (pHi).
Main Results:
- Total water content of the small intestine significantly increased in the edema group.
- Oxygen extraction ratios remained similar between edema and control groups at comparable oxygen supplies.
- Mesenteric venous lactate and pHi did not differ between groups after flow reduction.
- pHi correlated with oxygen uptake at low oxygen supply levels.
Conclusions:
- Acute elevation of extracellular volume, as induced in this study, does not impede oxygen uptake in the gut.
- Interstitial edema does not appear to limit the intestine's ability to extract oxygen under these experimental conditions.