Assuntos
Doenças do Córtex Suprarrenal/veterinária , Insuficiência Adrenal/veterinária , Anti-Infecciosos Urinários/efeitos adversos , Doenças do Cão , Hiperpotassemia/veterinária , Trimetoprima/efeitos adversos , Infecções Urinárias/veterinária , Doenças do Córtex Suprarrenal/complicações , Doenças do Córtex Suprarrenal/tratamento farmacológico , Insuficiência Adrenal/complicações , Insuficiência Adrenal/tratamento farmacológico , Animais , Cães , Fludrocortisona/uso terapêutico , Hiperpotassemia/sangue , Hiperpotassemia/induzido quimicamente , Masculino , Mineralocorticoides/uso terapêutico , Orquiectomia , Prednisona/uso terapêutico , Combinação Trimetoprima e Sulfametoxazol/efeitos adversos , Combinação Trimetoprima e Sulfametoxazol/uso terapêutico , Infecções Urinárias/tratamento farmacológicoRESUMO
Platelet aggregation and adenosine triphosphate (ATP) secretion in response to arachidonic acid (10 microM) or collagen (5 micrograms/ml) were compared in healthy, adult female Beagles treated with low-dosage aspirin (3.5 mg/kg of body weight, PO, q 12 h for 7 treatments) or with CGS 12970, a specific thromboxane synthetase inhibitor (10 mg/kg, PO, q 8 h for 10 treatments). Platelet aggregation was assessed in whole blood by use of an electrical impedance method. Baseline values obtained prior to treatment served as controls. Addition of arachidonic acid to blood from nontreated dogs resulted in significantly (P less than 0.001) increased impedance, but had no effect in blood from dogs treated with either aspirin or CGS 12970. Treatment with CGS 12970 or aspirin significantly (P less than 0.001) decreased platelet ATP secretion in response to arachidonic acid, compared with baseline values; however ATP secretion in aspirin-treated dogs was significantly (P less than 0.01) less than ATP secretion in CGS 12970-treated dogs. Differences in platelet aggregation were not observed between control dogs and aspirin- or CGS 12970-treated dogs in response to collagen as an aggregant, however, collagen-induced platelet ATP secretion was significantly (P less than 0.001) decreased in dogs treated with aspirin, compared with control values and values from dogs treated with CGS 12970. In dogs treated orally with 0.1, 0.2, 1.0, or 10 mg of CGS 12970/kg, dose-dependent inhibition of arachidonic acid-induced platelet aggregation was observed, with impedance changes not observed at the 10-mg/kg dosage and normal platelet aggregation associated with the 0.1-mg/kg dosage.(ABSTRACT TRUNCATED AT 250 WORDS)