Abstract

Objective-To investigate in vitro effects of isoeugenol on neuromuscular transmission in tissues obtained from rats. Sample Population-Tissues (phrenic nerve and diaphragm) obtained from 15 male Sprague-Dawley rats. Procedure-Rats were euthanatized, and tissues (phrenic nerves and diaphragm) were obtained. Phrenic nerve-diaphragm preparations were examined in vitro. The phrenic nerve was stimulated with weak electrical impulses. Muscle-twitch responses were recorded before and after the addition of drugs (pancuronium, neostigmine, isoeugenol, and benzocaine). Results-Pancuronium and isoeugenol in low concentrations (10 to 206muM) caused a distinct decrease in twitch response, which could be reversed by the addition of neostigmine. The decrease in twitch response caused by benzocaine or high concentrations of isoeugenol could not be reversed by the addition of neostigmine. Conclusions and Clinical Relevance-Isoeugenol caused a competitive blockade of neuromuscular transmission. Neostigmine restored this transmission by inhibiting acetylcholinesterase, which led to increased concentrations of acetylcholine. Because isoeugenol is used as an anesthetic in fish, further investigations are necessary to determine whether fish exposed-to isoeugenol are sedated and unconscious or whether they are only paralyzed but have intact perception in afferent sensory nerves. (Am J Vet Res 2003;64:690-693)

Keywords

isoeugenol; neuromuscular blockade; rat nerve-diaphragm

Published in

American Journal of Veterinary Research
2003, Volume: 64, number: 6, pages: 690-693
Publisher: AMER VETERINARY MEDICAL ASSOC

SLU Authors

• Ingvast Larsson, Carina

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

Publication identifier

DOI: https://doi.org/10.2460/ajvr.2003.64.690

Permanent link to this page (URI)

https://res.slu.se/id/publ/1296