Evaluation of anaesthetic stress following administration of dexmedetomidine and its combinations with midazolam, fentanyl and ketamine in dogs
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Keywords:
Dexmedetomidine, Dogs, Fentanyl, Midazolam, Stress indicatorsAbstract
The study was conducted on 16 apparently healthy adult dogs of either sex, randomly divided into 4 groups, each containing 4 animals. Animals of group A received dexmedetomidine (20 µg/kg) alone. Midazolam (0.2 mg/kg), fentanyl (4 µg/kg) + midazolam (0.2 mg/kg) and ketamine (10 mg/kg) + fentanyl (4 µg/kg) + midazolam (0.2 mg/kg) were administered along with dexmedetomidine (20 µg/kg) in the animals of groups B, C and D, respectively. All the drugs were given simultaneously by intramuscular route. Differential leucocytic count, plasma glucose, insulin and cortisol were measured at baseline (0 min) and at 30, 60 and 120 min after the drug administration. Neutrophilia was observed only for a very short period. Plasma insulin levels significantly decreased whereas a significant increase in the plasma glucose towards the end of the study period was observed except in group C in which it decreased. Cortisol levels were nonsignificantly lower than the base values throughout the study in all the groups. It could be concluded that dexmedetomidine and its combinations with midazolam, fentanyl and ketamine do not threaten homeostasis and can obtund the stress response associated with handling and anaesthetic procedures in dogs.
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