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Antiemetic Effect of Dexamethasone in Dogs Sedated with Xylazine  

Yang Jung-hoon (College of Veterinary Medicine, Kyungpook National University)
Kang Han-sem (College of Veterinary Medicine, Kyungpook National University)
Bae Jae-sung (College of Veterinary Medicine, Kyungpook National University)
Song Chang-hyun (College of Veterinary Medicine, Kyungpook National University)
Kim Jung-eun (College of Veterinary Medicine, Kyungpook National University)
Jin Hee-kyung (College of Veterinary Medicine, Kyungpook National University)
Jang Kwang-ho (College of Veterinary Medicine, Kyungpook National University)
Publication Information
Journal of Veterinary Clinics / v.22, no.2, 2005 , pp. 94-99 More about this Journal
Abstract
This prospective study aimed to assess the efficacy of dexamethasone to prevent xylazine induced emesis in dogs. The antiemetic effect of graded, single high-dose intravenous dexamethasone against xylazine hydrochloride was studied. Clinically healthy mixed breed dogs that weighed $ 4.64\pm1.25kg$ were used in this study. Food and water were given 3 hours before the experiment. Venous blood specimens were collected from all experimental animals for hema-tological and blood chemical test pre- and post-experiment. Twenty-eight experimental animals were randomly divided into 4 groups; the group treated with 0.2ml/kg of normal saline (Control group), the groups treated with 1mg/kg (D1 group), 2mg/kg (D2 group) and 4 mg/kg of dexamethasone (D4 group). Three doses of the dexamethasone or normal saline was administered intravenousely to each group and after 5 minutes, xylazine (2.2 mg/kg) was administered intramuscularly. The time until onset of the first emetic episode and rate of emesis were investigated. At the same time, the extent of sedation was scored subjectively 5, 15, 30 and 60 minutes after injection of xylazine hydrochloride using Visual Sedation Score. The time until onset of the first emetic episode was $203.25\pm11.35$ sec in Control group, $187.33\pm48.0l$ sec in D1 group and 218.33± 13.58 sec in D2 group. The rate of xylazine induced emesis were $57\%$ in Control group and $43\%$ in D1 and D2 group respectively. On the other hand, any emetic episodes were not observed in 04 group. At extent of sedation score, all experimental animals especially including the animals in D1 group were highly sedated at 15 minutes after administration of xylazine hydrochloride. Hematological and blood chemical values showed normal ranges pre- and post-experiment. We concluded that prior treatment with 4 mg/kg of dexamethasone hardly caused xylazine-induced emesis without disturbing the sedative effect of xylazine in dogs.
Keywords
dog; emesis; xylazine hydrochloride; dexamethasone;
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