Effects of constant rate infusions of dexmedetomidine,remifentanil and their combination on minimum alveolar concentration of sevoflurane in dogs |
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| Institution: | 1. Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan;2. Veterinary Medicine Teaching Hospital, College of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan;1. Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL, USA;2. Department of Animal Sciences, University of Illinois, Urbana, IL, USA;3. Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA;1. Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada;2. Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada;1. Department of Surgery, School of Veterinary Medicine, Metropolitan University of Santos, São Paulo, SP, Brazil;2. Department of Surgery, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, SP, Brazil;3. Department of Surgery, School of Veterinary Medicine, Paulista University, São Paulo, SP, Brazil;1. Department of Veterinary Medicine, Federal University of Fronteira Sul, Realeza, PR, Brazil;2. Laboratory of Veterinary Anesthesia and Analgesia, Federal University of Paraná, Curitiba, PR, Brazil;1. Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA;2. Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA, USA |
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| Abstract: | ObjectiveTo evaluate the effects of constant rate infusions (CRIs) of dexmedetomidine and remifentanil alone and their combination on minimum alveolar concentration (MAC) of sevoflurane in dogs.Study designRandomized crossover experimental study.AnimalsA total of six (three males, three females) healthy, adult neutered Beagle dogs weighing 12.6 ± 1.4 kg.MethodsAnesthesia was induced with sevoflurane in oxygen until endotracheal intubation was possible and anesthesia maintained with sevoflurane using positive-pressure ventilation. Each dog was anesthetized five times and was administered each of the following treatments: saline (1 mL kg–1 hour–1) or dexmedetomidine at 0.1, 0.5, 1.0 or 5.0 μg kg–1 loading dose intravenously over 10 minutes followed by CRI at 0.1, 0.5, 1.0 or 5.0 μg kg–1 hour–1, respectively. Following 60 minutes of CRI, sevoflurane MAC was determined in duplicate using an electrical stimulus (50 V, 50 Hz, 10 ms). Then, CRI of successively increasing doses of remifentanil (0.15, 0.60 and 2.40 μg kg–1 minute–1) was added to each treatment. MAC was also determined after 30 minutes equilibration at each remifentanil dose. Isobolographic analysis determined interaction from the predicted doses required for a 50% MAC reduction (ED50) with remifentanil, dexmedetomidine and remifentanil combined with dexmedetomidine, with the exception of dexmedetomidine 5.0 μg kg–1 hour–1, obtained using log-linear regression analysis.ResultsThe sevoflurane MAC decreased dose-dependently with increasing infusion rates of dexmedetomidine and remifentanil. Remifentanil ED50 values were lower when combined with dexmedetomidine than those obtained during saline–remifentanil. Synergistic interactions between dexmedetomidine and remifentanil for MAC reduction occurred with dexmedetomidine at 0.5 and 1.0 μg kg–1 hour–1.Conclusions and clinical relevanceCombined CRIs of dexmedetomidine and remifentanil synergistically resulted in sevoflurane MAC reduction. The combination of dexmedetomidine and remifentanil effectively reduced the requirement of sevoflurane during anesthesia in dogs. |
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| Keywords: | dexmedetomidine dog interaction minimum alveolar concentration remifentanil sevoflurane |
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