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The Thai Journal of Veterinary Medicine

Abstract

This study aimed to investigate and compare the effects of systemic administration of medetomidine and xylazine on ex vivo platelet aggregation inclinically normal cats.Five cats were repeatedly used in each of 7groups.The cats received saline as the non-medicated control; 0.5, 2.0, and 4.0 mg/kg xylazine; and 20, 80, and 160 μg/kg BW medetomidine intramuscularly.Venous blood was collected 4 times (0, 2, 4, and 7 h) after injection of both agents and platelet-rich plasma was prepared. Ex vivo percent platelet aggregationwas determined via a turbidimetric method. Collagen and adenosine diphosphate (ADP) were used to initiate aggregation. Administrations of xylazine at all dosages did not significantly change the platelet aggregation induced by ADP and collagen compared with the control. In contrast, administration of medetomidine at 80 μg/kg significantly reduced platelet aggregation induced by both ADP and collagen compared with the control, whereas medetomidine at the other dosages did not significantly change the platelet aggregation induced by ADP and collagen. These results indicate that systemic administration of xylazine can be used in feline practice without concern for adverse effects on platelet function, although, if medetomidine is used, even in limited dosages, it may inhibit platelet aggregation.

Publisher

Faculty of Veterinary Science, Chulalongkorn University

First Page

305

Last Page

314

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