Veterinary Anesthesiology is continuously in search of pharmacology containment to establish treatments, allowing safe and lasting manipulation, dispensing general anesthesia. The aim of the present study was to determine the use of dexmedetomidine in combination with ketamine and midazolam, or diazepam. The anesthetic technique was applied in 30 healthy dogs, male and female, weight between 10-15kg, and age between 2-4 years, divided in three groups (GI, GII and GIII). Group I (GI) received a pretreatment with atropine (0.044mg kg-1,SC), and 15 minutes later, a single dose of dexmedetomidine at 3µg kg, IV (induction), during two minutes. For maintenance was induced the same dose of dexmedetomidine (3µg kg h-1) combined with the ketamine (2mg kg h-1), all dilute in 20ml of distilled water, during one-hour infusion. Group II (GII) received the same treatment as GI, however, received midazolam at 0.2mg kg-1 in combination with dexmedetomidine, and another dose of 0.2mg kg h-1, in combination with dexmedetomidine and ketamine along with one hour maintenance. Group III (GIII) received the same treatment as GII, but diazepam was used instead of midazolam as induction dose at 0.5mg kg-1, and 0.5mg kg h-1 in the maintenance dose. Benzodiazepines effects were evaluated forward the cataleptic effects (contraction) of ketamine over dexmedetomidine. The respiratory and oxycapnomethetic parameters, bispectral index and recuperation period were also evaluated. After collection of the data, the statistic evaluation was done by Morrison’s multivariate statistical methods. It was possible to conclude that the benzodiazepines combination showed synergistic interaction in sedation and muscle relaxant, with cardiorespiratory stability after pretreated with atropine, being a great value as in containment pharmacology.
dexmedetomidine; ketamine; benzodiazepines; continuous infusion; dog
