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1.  Aspirin Therapy for Inhibition of Platelet Reactivity in the Presence of Erythrocytes in Patients with Vascular Disease 
Inhibition of erythrocyte (RBC) promotion of platelet reactivity could improve the antiplatelet effect of aspirin (ASA). We tested different ASA regimens for optimal inhibition of platelets and the effects of RBC in patients with a history of vascular diseases. Collagen-induced platelet activation (14C-5HT, TXA2 release) and platelet recruitment (proaggregatory activity of cell-free releasates from activated platelets) were measured in PRP, platelet-RBC (Hct 40%) and whole blood (WB) in 206 patients initially on 200–300 mg ASA/day. Their regimen was modified to bi-weekly 500 mg (loading dose, L) plus daily or twice-daily low-dose ASA (50 or 100 mg). TXA2 was inhibited with all regimens. Percentage of patients with suboptimal inhibition of platelet recruitment in WB was: 200–300 ASA/day (41%), L-50/day (87%), L-100/day (58%), L-50/twice-daily (39%) and L-100/twice-daily (20%; p<0.05 vs. other regimens). 14C-5HT release was inhibited to the greatest extent with L-100/twice-daily in PRP+RBC or WB (p<0.05 vs. other regimens) due to greater inhibition of the RBC prothrombotic effect. Compared to other ASA regimens, L-100 twice-daily (equivalent to 221 mg ASA/day in the 14 day cycle), reduced by >50% the proportion of patients with suboptimal inhibition of platelet recruitment in WB and inhibited 14C-5HT release to the greatest extent.
doi:10.1016/j.lab.2005.12.005
PMCID: PMC1600016  PMID: 16697769
aspirin; blood cells; platelets; erythrocytes; cardiovascular diseases; cerebrovascular disorders; thrombosis; ADP: adenosine 5′-diphosphate; ASA: acetylsalicylic acid; BID: twice-daily; 14C-5HT: 14C-serotonin; COX-1: cyclooxygenase-1; L: loading dose; OD: daily; PRP: platelet-rich plasma; RBC: erythrocyte; TXA2: thromboxane A2; WB: whole blood

Results 1-1 (1)