Standardization of light transmittance aggregometry for monitoring antiplatelet therapy: an adjustment for platelet count is not necessary

Journal of Thrombosis and Haemostasis : JTH
B LinnemannE Lindhoff-Last

Abstract

Light transmittance aggregometry (LTA) is considered to be the 'gold standard' of platelet function testing. As LTA has been poorly standardized, we analyzed the results of LTA in healthy subjects and patients with antiplatelet therapy using different concentrations of agonists and performing tests in non-adjusted and platelet count-adjusted platelet-rich plasma (PRP). LTA was performed in 20 healthy subjects and in patients treated with aspirin (n = 30) or clopidogrel (n = 30) monotherapy, as well as in patients on combination therapy (n = 20), using arachidonic acid (ARA 0.25 and 0.5 mg mL(-1)) and adenosine diphosphate (ADP 2 and 5 microm) as agonists and performing platelet function tests in non-adjusted and platelet count (250 nL(-1) +/- 10%)-adjusted PRP. The overall platelet aggregation response is decreased after adjusting the PRP for platelet count compared with measurements in unadjusted PRP. The variability of aggregation results is high in adjusted PRP in the subgroup of healthy subjects, ranging from 9.2-95.3% (5th-95th percentile) relative to 77.6-95.5% in non-adjusted PRP when determining maximum aggregation to ARA 0.5 mg mL(-1). Late aggregation using ADP 2 microm ranges from 3.8-89.9% in adjusted PRP compared w...Continue Reading

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Citations

Sep 4, 2009·Der Anaesthesist·C F WeberK Görlinger
Jan 6, 2010·Annals of Hematology·Birgit LinnemannEdelgard Lindhoff-Last
Jun 5, 2013·Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association·Thomas GremmelSimon Panzer
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