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This article is part of the supplement: 31st International Symposium on Intensive Care and Emergency Medicine

Poster presentation

Cannabinoid receptor-1 inhibition causes anesthetic-induced excitation in septic rats

R Kuschnereit*, C Lehmann, S Whynot, O Hung, R Shukla, D Henzler, V Cerny, D Pavlovic and M Kelly

  • * Corresponding author: R Kuschnereit

Author Affiliations

Dalhousie University, Halifax, Canada

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Critical Care 2011, 15(Suppl 1):P360  doi:10.1186/cc9780


The electronic version of this article is the complete one and can be found online at: http://ccforum.com/content/15/S1/P360


Published:11 March 2011

© 2011 Kuschnereit et al.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction

In systemic inflammation and sepsis, the endo-cannabinoid system is upregulated [1]. While it is known that neuronal cannabinoid signalling via cannabinoid receptor-1 (CB1) in the central nervous system represents an intrinsic neuroprotective response [2] and exerts anti-epileptic activity [3], inhibition of CB1 (CB1inh) has been suggested as an experimental target for sepsis therapy [4]. We studied the effects of CB1inh in rats with experimental sepsis during anesthesia induction with pentobarbital.

Methods

Five groups of Lewis rats were included in the study: Group 1 - sham-operated controls treated with CB1inh (AM281, 2.5 mg/kg i.v., n = 12), Group 2 - animals with colon ascendens stent peritonitis (CASP)-induced sepsis treated with CB1inh (n = 12). As additional control groups we administered in CASP animals the CB1 agonist ACEA (2.5 mg/kg i.v.; Group 3; n = 4) or the solvent DMSO (Group 4; n = 4). In Group 5 we administered 50 mg/kg ketamine for induction of anesthesia 14 hours following the CASP treated by CB1inh. All other groups received a standard dose of pentobarbital (40 mg/kg i.v.) 14 hours following CASP procedure.

Results

In five out of 12 septic animals (42%) with CB1inh (Group 2) we observed tonic-clonic seizures immediately after induction of anesthesia with a standard dose of pentobarbital. In sham-operated animals (Group 1) or CASP animals without CB1inh (Group 4) we did not observe anesthetic-induced excitation. Replacement of the barbiturate by ketamine (Group 5) avoided seizures as well as treatment with the CB1 agonist (Group 3).

Conclusions

CB1 inhibition in sepsis may increase the incidence of anesthetic-induced excitation and reduce CB1-mediated intrinsic neuroprotective response.

References

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