Enhanced platelet accumulation onto injured carotid arteries in rabbits after aspirin treatment.
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Key result
Aspirin at doses of 10 mg/kg and 100 mg/kg significantly enhanced platelet accumulation onto injured carotid arteries in rabbits compared to control, persisting for at least 20 hours.
Why the study?
Does aspirin enhance platelet accumulation onto injured carotid arteries in rabbits?
Population
Rabbits subjected to a carotid artery injury model (stasis and clamping).
Comparison
Aspirin 3, 10, or 100 mg/kg intravenously given… vs Control (0 mg/kg ASA, suspending vehicle).
Design
Preclinical
Follow-up
up to 20 hours
Authors
Discussion
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Implication
Challenges assumed safety margin of aspirin in arterial injury; challenges prior predictions from endothelial cell and venous thrombosis models.
Structured PICO
Does aspirin enhance platelet accumulation onto injured carotid arteries in rabbits?
P
Population
Rabbits subjected to a carotid artery injury model (stasis and clamping).
I
Intervention
Aspirin (ASA) 3, 10, or 100 mg/kg intravenously given 1, 3, 6, or 20 hours before injury.
C
Comparator
Control (0 mg/kg ASA, suspending vehicle).
O
Outcome
Platelet accumulation onto injured carotid arteries (measured via 51Cr-labeled platelets).surrogate
Main Result
Absolute Event Rate: 1.24% vs 0.84%
p-value: p=<0.01
Aspirin at doses that inhibit vessel wall PGI2 production enhances platelet accumulation on injured arteries in rabbits, suggesting a potential thrombogenic effect at certain doses.
Limitations
- Animal model (rabbits) which may not directly translate to human clinical outcomes
- In vitro and in vivo bioassays used to estimate PGI2-like activity rather than direct measurement of all metabolites
Cite This Study
Buchanan et al. (1981) studied Arterial thrombosis (animal model) (n=89). Aspirin (ASA) vs. Control (0 mg/kg ASA) was evaluated on Mean platelet accumulation onto injured carotid arteries (x 10^6/10 mm^2 vessel wall) (p=<0.01). Aspirin at doses of 10 mg/kg and 100 mg/kg significantly enhanced platelet accumulation onto injured carotid arteries in rabbits compared to control, persisting for at least 20 hours.
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