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Thrombopathies causing bleeding in a boxer and mixed-breed dog.

M B Callan1, R Walton, P F Jezyk

  • 1Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104-6010, USA.

Journal of the American Animal Hospital Association
|May 22, 2001
PubMed
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Two dogs with hereditary platelet function disorders showed prolonged bleeding times and impaired platelet aggregation. These findings suggest potential secretion or signal transduction defects in canine thrombopathies.

Area of Science:

  • Veterinary Medicine
  • Hematology
  • Canine Diseases

Background:

  • Hereditary platelet function disorders cause bleeding despite normal platelet counts.
  • These disorders are characterized by prolonged bleeding times and impaired platelet aggregation.

Observation:

  • Two young dogs presented with increased bleeding tendencies and prolonged buccal mucosal bleeding times.
  • Plasma coagulation times and von Willebrand factor concentrations were normal in both dogs.
  • Platelet aggregation studies showed minimal response to adenosine diphosphate and collagen.

Findings:

  • Platelets exhibited normal adenine nucleotide concentrations.
  • Electron microscopy confirmed the presence of glycoprotein IIb/IIIa and Ib receptors.
  • The dogs' intrinsic platelet defects may involve secretion or signal transduction pathways.

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Implications:

  • This study highlights potential novel platelet function defects in dogs.
  • Understanding these defects can aid in diagnosing and managing canine bleeding disorders.
  • Further research may elucidate specific molecular mechanisms underlying canine thrombopathies.