title: Measurement of platelet function in dogs using a novel impedance aggregometer.
abstract: The aim of this study was to optimise the technique and establish reference values for whole blood aggregometry in dogs using a novel multiplate analyser. Measurements were performed on the hirudin-anticoagulated blood of healthy dogs using a wide range of agonists. Optimal agonist concentrations were 10 micromol/L of adenosine diphosphate, 5 microg/mL of collagen and 1 mmol/L of arachidonic acid. Ristocetin (at 0.2 and 1 mg/mL) and thrombin receptor activating peptide (TRAP-6 at 32 and 160 micromol/L) did not consistently induce platelet aggregation. Coefficients of variance for within-run imprecision (n=10 repetitions) varied from 5% to 18%. Measurement signals were significantly higher when analyses were performed on standard samples (hirudin-anticoagulated blood) compared to citrated blood or blood samples anticoagulated with citrate buffer, regardless of whether or not re-calcification was performed (P<0.05). The findings indicate that the analyser is suitable for the investigation of platelet aggregation in dogs and analysis should be performed on hirudin-anticoagulated blood using optimised agonist concentrations.
authors.affiliation: Small Animal Clinic, Hannover School of Veterinary Medicine, Bischofsholer Damm 15, D-30173 Hannover, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Kalbantner
authors.forename: A
authors.initials: A
authors.lastname: Baumgarten
authors.forename: R
authors.initials: R
authors.lastname: Mischke
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000818:Animals; D000925:Anticoagulants / Q000494:pharmacology*; D016718:Arachidonic Acid / Q000494:pharmacology; D001792:Blood Platelets / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D019343:Citric Acid / Q000494:pharmacology; D003094:Collagen / Q000494:pharmacology; D004285:Dogs / Q000097:blood*; D017097:Electric Impedance; D005260:Female; D006629:Hirudins / Q000494:pharmacology; D008297:Male; D010446:Peptide Fragments / Q000494:pharmacology; D010974:Platelet Aggregation / Q000187:drug effects* / Q000502:physiology; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D010979:Platelet Function Tests / Q000295:instrumentation / Q000379:methods / Q000592:standards / Q000662:veterinary*; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000925:Anticoagulants; D006629:Hirudins; D010446:Peptide Fragments; D010975:Platelet Aggregation Inhibitors; C082835:thrombin receptor peptide (42-47); D016718:Arachidonic Acid; D019343:Citric Acid; D000244:Adenosine Diphosphate; D003094:Collagen