Studies on platelet aggregation using the Born method in normal and uraemic dogs

Area of Science:

• Veterinary Medicine
• Hematology
• Canine Physiology

Background:

• Platelet aggregation is crucial for hemostasis.
• Determining normal reference values for platelet function in dogs is essential for diagnosing bleeding disorders.
• The Born method provides a reliable measure of platelet aggregation.

Purpose of the Study:

• To establish minimum effective concentrations (threshold values) of common platelet agonists for inducing maximum platelet aggregation in healthy dogs.
• To investigate the impact of uremia on platelet aggregation responses in dogs.

Main Methods:

• Light transmission aggregometry (Born method) was used to assess platelet aggregation in platelet-rich plasma from healthy and uremic dogs.
• Various concentrations of adenosine diphosphate (ADP), collagen, thrombin, ristocetin, and epinephrine were tested.
• Aggregation responses were compared between healthy and uremic canine groups.

Main Results:

• Reference values for maximum platelet aggregation (>80%) were established for ADP (25 µmol/L), collagen (≥10 µg/mL), and thrombin (≥1 IU/mL) in healthy dogs.
• Epinephrine and ristocetin did not induce significant aggregation in healthy dogs at the tested concentrations.
• Uremic dogs exhibited significantly decreased platelet aggregation at intermediate agonist concentrations but increased aggregation at low concentrations of ADP, collagen, and thrombin compared to healthy controls.

Conclusions:

• Normal canine platelet aggregation thresholds were defined for key agonists.
• Uremia significantly alters canine platelet aggregation, affecting responses differently based on agonist concentration.
• These findings provide valuable reference data for veterinary hematology and diagnostics.