Alterations of primary hemostasis in azotemic dogs / Alterações da hemostasia primária em cães azotêmicos

ABSTRACT

Background: Uremia is a cause of acquired platelet dysfunction. Normal platelet counts and normal coagulation tests, associated with prolonged bleeding time, suggest a qualitative platelet defect. The objective of this study was to verify the presence of abnormalities in primary hemostasis associated with azotemia in dogs, and the correlation of the buccal mucosal bleeding time (BMBT) with urea and creatinine levels. Materials, Methods & Results: Forty azotemic dogs were evaluated for hemostasis. Dogs were included in the study if serum urea concentration was > 60 mg / dL and serum creatinine concentration was > 2.0 mg / dL. The BMBT was performed on the inner surface of the upper lip, using a commercial device. Blood was collected from de jugular vein in EDTA-K2, sodium citrate 3.2% tubes and tubes without anticoagulant. EDTA samples were used to perform red blood cell (RBC) and platelets count. Serum was used for determination of urea, creatinine, alanine aminotransferase (ALT), alkaline phosfatase (ALP), albumin and total protein. Citrated plasma was used to determine activated partial thromboplastin time (aPTT), prothrombin time (PT), fibrinogen levels, von Willebrand factor antigen (vWFAg) and fibrin degradation products (FDPs). Statistical analysis used Mann-Whitney test, Kruskal-Wallis test and/or Spearman correlation coefficient. A multiple linear regression

RESUMO

A uremia é causa de disfunção plaquetária adquirida em pessoas e animais. Dentre os sinais clínicos encontrados em cães com síndrome urêmica, o sangramento pode estar presente e manifestar-se sob a forma de petéquias, equimoses, sangramento gastrintestinal, gengival e dos locais de venopunção. Sangramentos associados a quantidade normal de plaquetas e concentração de fatores da coagulação normais sugerem um defeito qualitativo plaquetário. O prolongamento no tempo de sangramento da mucosa oral (TSMO) em quatro de oito cães com insufi ciência renal induzida foi um achado consistente com o defeito de adesão plaquetária. [...]