Platelet aggregation studies in acute experimental canine ehrlichiosis

Background: Thrombocytopenia is the most common and consistent hematologic finding in patients with canine monocytic ehrlichiosis. Dogs that recover from the severe thrombocytopenia still show bleeding tendencies, which suggest that platelet dysfunction is present. Objectives: The purpose of this st...

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Bibliographic Details
Published in:Veterinary clinical pathology 2006-03, Vol.35 (1), p.78-81
Main Authors: Brandao, L.P, Hasegawa, M.Y, Hagiwara, M.K, Kohayagawa, A
Format: Article
Language:English
Subjects:
acute course
Animals
blood platelets
canine monocytic ehrlichiosis
Dog
dog diseases
Dog Diseases - blood
Dogs
Ehrlichia canis
Ehrlichia canis - pathogenicity
ehrlichiosis
Ehrlichiosis - blood
Ehrlichiosis - veterinary
Female
females
infection
Male
males
Platelet Aggregation
platelet function
signs and symptoms (animals and humans)
thrombocytopenia
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Summary:Background: Thrombocytopenia is the most common and consistent hematologic finding in patients with canine monocytic ehrlichiosis. Dogs that recover from the severe thrombocytopenia still show bleeding tendencies, which suggest that platelet dysfunction is present. Objectives: The purpose of this study was to determine the occurrence and duration of platelet dysfunction in dogs with ehrlichiosis and to assess whether dysfunction is related to thrombocytopenia. Methods: Ten adult male and female mongrel dogs were used in the study; 7 were inoculated intravenously with whole blood containing Ehrlichia canis, and 3 were used as controls. Platelet aggregation (with collagen/epinephrine and adenosine diphosphate (ADP)/epinephrine) and platelet counts were evaluated weekly for 112 days. Results: The infected group showed a decrease in platelet aggregation response to collagen/epinephrine and ADP/epinephrine on days 7, 14, 21, 28, and 35 (P < .05). Thrombocytopenia was observed in all infected animals from day 7 to 35 postinfection (P < .05). Conclusions: The tendency of dogs infected with E canis to bleed may be related not only to thrombocytopenia but also to platelet dysfunction associated with the disease.
ISSN:0275-6382
1939-165X
DOI:10.1111/j.1939-165X.2006.tb00091.x