Comparative study on epidural administration of dexmedetomidine, dexmedetomidine–lidocaine or lidocaine in conscious rabbits

Author:

Santos Maria AAP1,Lucera Tiago MC1,Horr Mônica1,Santana Isabella N2,Mattos-Junior Ewaldo1ORCID

Affiliation:

1. Veterinary Science Graduate Program, University of Franca, Brazil

2. Departamento de Clínica e Cirurgia, UNESP, Campus Jaboticabal, Brazil

Abstract

The aim of this study was to compare the cardiorespiratory, arterial blood gas and antinociceptive effects of dexmedetomidine (D), dexmedetomidine–lidocaine (DL) or lidocaine (L) administered epidurally on conscious rabbits. Eight six-month-old male New Zealand rabbits were randomly distributed into three treatments: D (2.5 μg/kg); DL (2.5 μg/kg; 2 mg/kg); and L (2 mg/kg). The drugs were injected epidurally via a catheter. Cardiorespiratory, arterial blood gas and antinociceptive variables were recorded before administration, 5 and 10 min after drug administration, then every 10 min until the animals presented a positive response to nociceptive stimulation of perineal dermatomes. Two animals had permanent paralysis after DL treatment due to hemorrhage and congestion with neuron necrosis in spinal cord segments. There was a reduction in mean arterial pressure in treatment L at 5 and 10 min, compared with the baseline, and in treatment DL at 10–30 min. Increases in pH were observed in treatment D at 5 and 10 min, and in DL at all the times evaluated, compared with the baseline. No alterations were observed in other blood gas or electrolyte variables. Antinociceptive effects were evaluated in the perineal, sacral and lumbar regions, and were restricted to the perineal region following D and L treatment. The antinociceptive effects following DL were greater than D and L alone in all of the regions. L and D promotes short-term antinociceptive effects for up to 15 min and, when used in combination with D, increased the duration and extent of sensory block by up to 45 min.

Funder

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Publisher

SAGE Publications

Subject

General Veterinary,Animal Science and Zoology

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