Abstract
Until now, the PFA-100® system has been considered unsuitable for monitoring clopidogrel efficacy. The authors evaluated platelet function in peripheral arterial occlusive disease (PAOD) patients using a new PFA-100® test cartridge (product name: INNOVANCE® PFA P2Y*) specifically designed for this purpose. Twenty-two stable PAOD patients on antithrombotic therapy with clopidogrel alone (n = 22) and 18 patients undergoing a peripheral catheter intervention, preliminarily treated with 100 mg/day of aspirin followed by co-administration of clopidogrel (loading dose 300 mg, maintenance dose 75 mg/day), were enrolled in this study. Defining non-responsiveness to clopidogrel as an aggregation response within the reference range (90% central interval), four (18.2%) non-responders using light transmittance aggregometry (LTA) induced by 5 µM adenosine diphosphate (ADP) and six (27.3%) non-responders using LTA induced by 2 µM ADP (LateAggr >72.1% and >42.9%, respectively) were identified. INNOVANCE® PFA P2Y* determined six (27.3%) non-responders (CT < 87 s). Agreement between the two aggregometry assays and INNOVANCE® PFA P2Y* on the definition of clopidogrel response and non-response exceeded 70%. Only three patients were uniformly identified as clopidogrel non-responders by all three assays. When clopidogrel was co-administered with aspirin, two (11.1%) non-responders to clopidogrel were detected with INNOVANCE® PFA P2Y*, whereas ADP-induced LTA found all patients to be responsive. INNOVANCE® PFA P2Y* appears to be suitable for monitoring the effect of clopidogrel on platelet function. Its sensitivity in detecting responsiveness or non-responsiveness to clopidogrel is comparable to ADP-induced LTA. Additional prospective studies are needed to clarify the clinical relevance of the test results and classification obtained with INNOVANCE® PFA P2Y*.
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The study was supported by Siemens Healthcare Diagnostics Products GmbH, Germany, of which Dr. Andreas R. Rechner is an employee.
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The INNOVANCE® PFA P2Y product is under development—not yet available for sale.
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Linnemann, B., Schwonberg, J., Rechner, A.R. et al. Assessment of clopidogrel non-response by the PFA-100® system using the new test cartridge INNOVANCE® PFA P2Y. Ann Hematol 89, 597–605 (2010). https://doi.org/10.1007/s00277-009-0881-9
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DOI: https://doi.org/10.1007/s00277-009-0881-9