PMID: 11901313Mar 20, 2002Paper

Hypoxia is not the sole cause of lactate production during shock

The Journal of Trauma
F A LuchetteJ H James

Abstract

Traditionally, elevated blood lactate after hemorrhage is interpreted as tissue hypoperfusion, hypoxia, and anaerobic glycolysis. The severity and duration of the increase in blood lactate correlate with death. Recent in vitro studies indicate that epinephrine stimulates lactate production in well-oxygenated skeletal muscle by increasing activity of the Na+-K+-adenosine triphosphatase (ATPase), which derives a significant amount of adenosine triphosphate from glycolysis. Using in vivo microdialysis, we tested whether inhibiting the Na+-K+ pump with ouabain could reduce muscle lactate production during local exposure, via the microdialysis probe, to epinephrine or during hemorrhage in rats. Microdialysis catheters were placed in the muscle of both thighs of pentobarbital-anesthetized male Sprague-Dawley rats (275-350 g) and perfused (1 microL/min) with Krebs-phosphate buffer (pH 7.4) containing ethanol (5 mmol/L) to permit assessment of changes in local blood flow. To inhibit the Na+-K+-ATPase, ouabain (2-3 mmol/L) was added to the perfusate of one leg. In one series of studies, epinephrine was added to the perfusate. In another series, rats were hemorrhaged to a mean arterial pressure of 45 mm Hg for 30 minutes, followed by res...Continue Reading

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Citations

Apr 14, 2007·Intensive Care Medicine·Stephen TrzeciakJoseph E Parrillo
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