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Volume 3 Supplement 1


  • Poster presentation
  • Open Access

Dexmedetomidine ameliorates gut lactate production and impairment of exogenous lactate clearance in an endotoxic sheep model

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Intensive Care Medicine Experimental20153 (Suppl 1) :A414

  • Published:


  • Dexmedetomidine
  • Endotoxic Shock
  • Epinephrine Level
  • Sublingual Microcirculation
  • Arterial Lactate Level


The mechanisms of persistent hyperlactemia during endotoxic shock are probably multifactorial. Both hypoperfusion-related anaerobic production and adrenergic-driven aerobic generation have been implicated. More recently an early and severe impairment in exogenous lactate clearance has also been described [1]. Theoretically, an excessive adrenergic response could influence all these mechanisms and thus aggravate the problem.


To assess the effects of dexmedetomidine (DEX) on lactate production and exogenous lactate clearance in an endotoxic shock model.


Twelve anesthetized sheep were subjected to a multimodal hemodynamic/perfusion assessment including hepatic and portal vein catheterizations, total hepatic blood flow, sublingual microcirculation, and muscle microdialysis. After the monitoring phase, all received a 5 mcg/kg LPS bolus (E coli O127:B8®) and then 4 mcg·kg1·hr1 for the rest of the experiment. After 1hr they were volume resuscitated, and then randomized to placebo or DEX. Sampling and exogenous lactate clearances [2] were performed at 4 points (figure 1).

Figure 1


DEX was not associated with any adverse hemodynamic effect in terms of cardiac output, heart rate, mixed venous oxygen saturation, central venous-arterial pCO2 gradient and NE requirements as compared to placebo. DEX animals presented significant lower epinephrine levels (4.6 ± 1.3 vs 7.1 ± 1.4 ng/ml), arterial lactate levels (6.4 ± 3.1 vs 9.2 ± 1.8 mmol/l), portal vein lactate levels (6.2 ± 2.2 vs 8.1 ± 2.0 mmol/l); and higher portal vein O2 saturations (78 ± 16 vs 68 ± 11 %), and exogenous lactate clearance (7.2 ± 5.4 vs 2.9 ± 1.5 ml/kg/min) as compared to placebo at point D. No differences in muscle lactate production or sublingual microcirculatory parameters could be observed.


Dexmedetomidine ameliorates the increase in gut lactate production and impairment of exogenous lactate clearance in experimental endotoxic shock. This effect is associated with a significant reduction in systemic epinephrine levels.

Grant Acknowledgment

FONDECYT 1130200, Chile

Authors’ Affiliations

Pontificia Universidad Catolica de Chile, Santiago, Chile
Fundación Valle del Lili, Cali, Colombia
Universidad de Chile, Santiago, Chile
Erasmus MC University Medical Center, Rotterdam, the Netherlands


  1. Tapia P, Soto D, Bruhn A, Regueira T, Jarufe N, Alegria L, et al: 0101. Early and severe impairment of lactate clearance in endotoxic shock is not related to liver hypoperfusion: preliminary report. Intensive Care Medicine Experimental. 2014, 2 (Suppl 1): P12View ArticleGoogle Scholar
  2. Levraut J, Ciebiera JP, Chave S, Rabary O, Jambou P, Carles M, Grimaud D: Mild hyperlactatemia in stable septic patients is due to impaired lactate clearance rather than overproduction. Am J Respir Crit Care Med. 1998, 157: 1021-1026.PubMedView ArticleGoogle Scholar


© Hernandez et al.; 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.